QtNetwork: use _L1 for for creating Latin-1 string literals

Task-number: QTBUG-98434
Change-Id: Ic235b92377203f7a1429ae7fd784c4a1fa893e9f
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

53 files changed, 514 insertions, 441 deletions

diff --git a/src/network/access/http2/http2protocol.cpp b/src/network/access/http2/http2protocol.cpp
index 5a2763a0e0..1ac1c8e1fb 100644
--- a/src/network/access/http2/http2protocol.cpp
+++ b/src/network/access/http2/http2protocol.cpp
@@ -50,6 +50,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QT_IMPL_METATYPE_EXTERN_TAGGED(Http2::Settings, Http2__Settings)
 
 Q_LOGGING_CATEGORY(QT_HTTP2, "qt.network.http2")
@@ -130,7 +132,7 @@ void qt_error(quint32 errorCode, QNetworkReply::NetworkError &error,
 {
     if (errorCode > quint32(HTTP_1_1_REQUIRED)) {
         error = QNetworkReply::ProtocolFailure;
-        errorMessage = QLatin1String("RST_STREAM with unknown error code (%1)");
+        errorMessage = "RST_STREAM with unknown error code (%1)"_L1;
         errorMessage = errorMessage.arg(errorCode);
         return;
     }
@@ -144,61 +146,61 @@ void qt_error(quint32 errorCode, QNetworkReply::NetworkError &error,
         break;
     case PROTOCOL_ERROR:
         error = QNetworkReply::ProtocolFailure;
-        errorMessage = QLatin1String("HTTP/2 protocol error");
+        errorMessage = "HTTP/2 protocol error"_L1;
         break;
     case INTERNAL_ERROR:
         error = QNetworkReply::InternalServerError;
-        errorMessage = QLatin1String("Internal server error");
+        errorMessage = "Internal server error"_L1;
         break;
     case FLOW_CONTROL_ERROR:
         error = QNetworkReply::ProtocolFailure;
-        errorMessage = QLatin1String("Flow control error");
+        errorMessage = "Flow control error"_L1;
         break;
     case SETTINGS_TIMEOUT:
         error = QNetworkReply::TimeoutError;
-        errorMessage = QLatin1String("SETTINGS ACK timeout error");
+        errorMessage = "SETTINGS ACK timeout error"_L1;
         break;
     case STREAM_CLOSED:
         error = QNetworkReply::ProtocolFailure;
-        errorMessage = QLatin1String("Server received frame(s) on a half-closed stream");
+        errorMessage = "Server received frame(s) on a half-closed stream"_L1;
         break;
     case FRAME_SIZE_ERROR:
         error = QNetworkReply::ProtocolFailure;
-        errorMessage = QLatin1String("Server received a frame with an invalid size");
+        errorMessage = "Server received a frame with an invalid size"_L1;
         break;
     case REFUSE_STREAM:
         error = QNetworkReply::ProtocolFailure;
-        errorMessage = QLatin1String("Server refused a stream");
+        errorMessage = "Server refused a stream"_L1;
         break;
     case CANCEL:
         error = QNetworkReply::ProtocolFailure;
-        errorMessage = QLatin1String("Stream is no longer needed");
+        errorMessage = "Stream is no longer needed"_L1;
         break;
     case COMPRESSION_ERROR:
         error = QNetworkReply::ProtocolFailure;
-        errorMessage = QLatin1String("Server is unable to maintain the "
-                                     "header compression context for the connection");
+        errorMessage = "Server is unable to maintain the "
+                       "header compression context for the connection"_L1;
         break;
     case CONNECT_ERROR:
         // TODO: in Qt6 we'll have to add more error codes in QNetworkReply.
         error = QNetworkReply::UnknownNetworkError;
-        errorMessage = QLatin1String("The connection established in response "
-                        "to a CONNECT request was reset or abnormally closed");
+        errorMessage = "The connection established in response "
+                       "to a CONNECT request was reset or abnormally closed"_L1;
         break;
     case ENHANCE_YOUR_CALM:
         error = QNetworkReply::UnknownServerError;
-        errorMessage = QLatin1String("Server dislikes our behavior, excessive load detected.");
+        errorMessage = "Server dislikes our behavior, excessive load detected."_L1;
         break;
     case INADEQUATE_SECURITY:
         error = QNetworkReply::ContentAccessDenied;
-        errorMessage = QLatin1String("The underlying transport has properties "
-                                     "that do not meet minimum security "
-                                     "requirements");
+        errorMessage = "The underlying transport has properties "
+                       "that do not meet minimum security "
+                       "requirements"_L1;
         break;
     case HTTP_1_1_REQUIRED:
         error = QNetworkReply::ProtocolFailure;
-        errorMessage = QLatin1String("Server requires that HTTP/1.1 "
-                                     "be used instead of HTTP/2.");
+        errorMessage = "Server requires that HTTP/1.1 "
+                       "be used instead of HTTP/2."_L1;
     }
 }
 
diff --git a/src/network/access/qhstsstore.cpp b/src/network/access/qhstsstore.cpp
index 67be8a2de2..0ff84c26f8 100644
--- a/src/network/access/qhstsstore.cpp
+++ b/src/network/access/qhstsstore.cpp
@@ -52,6 +52,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 static QString host_name_to_settings_key(const QString &hostName)
 {
     const QByteArray hostNameAsHex(hostName.toUtf8().toHex());
@@ -136,13 +138,13 @@ QString QHstsStore::absoluteFilePath(const QString &dirName)
 {
     const QDir dir(dirName.isEmpty() ? QStandardPaths::writableLocation(QStandardPaths::CacheLocation)
                                      : dirName);
-    return dir.absoluteFilePath(QLatin1String("hstsstore"));
+    return dir.absoluteFilePath("hstsstore"_L1);
 }
 
 void QHstsStore::beginHstsGroups()
 {
-    store.beginGroup(QLatin1String("StrictTransportSecurity"));
-    store.beginGroup(QLatin1String("Policies"));
+    store.beginGroup("StrictTransportSecurity"_L1);
+    store.beginGroup("Policies"_L1);
 }
 
 void QHstsStore::endHstsGroups()
diff --git a/src/network/access/qhttp2protocolhandler.cpp b/src/network/access/qhttp2protocolhandler.cpp
index 4e104028b6..7c6d09d41c 100644
--- a/src/network/access/qhttp2protocolhandler.cpp
+++ b/src/network/access/qhttp2protocolhandler.cpp
@@ -65,6 +65,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 namespace
 {
 
@@ -239,8 +241,7 @@ void QHttp2ProtocolHandler::_q_uploadDataReadyRead()
     auto &stream = activeStreams[streamID];
 
     if (!sendDATA(stream)) {
-        finishStreamWithError(stream, QNetworkReply::UnknownNetworkError,
-                              QLatin1String("failed to send DATA"));
+        finishStreamWithError(stream, QNetworkReply::UnknownNetworkError, "failed to send DATA"_L1);
         sendRST_STREAM(streamID, INTERNAL_ERROR);
         markAsReset(streamID);
         deleteActiveStream(streamID);
@@ -354,8 +355,7 @@ bool QHttp2ProtocolHandler::sendRequest()
     for (auto it = requests.begin(), endIt = requests.end(); it != endIt;) {
         const auto &pair = *it;
         const QString scheme(pair.first.url().scheme());
-        if (scheme == QLatin1String("preconnect-http")
-            || scheme == QLatin1String("preconnect-https")) {
+        if (scheme == "preconnect-http"_L1 || scheme == "preconnect-https"_L1) {
             m_connection->preConnectFinished();
             emit pair.second->finished();
             it = requests.erase(it);
@@ -410,14 +410,14 @@ bool QHttp2ProtocolHandler::sendRequest()
         Stream &newStream = activeStreams[newStreamID];
         if (!sendHEADERS(newStream)) {
             finishStreamWithError(newStream, QNetworkReply::UnknownNetworkError,
-                                  QLatin1String("failed to send HEADERS frame(s)"));
+                                  "failed to send HEADERS frame(s)"_L1);
             deleteActiveStream(newStreamID);
             continue;
         }
 
         if (newStream.data() && !sendDATA(newStream)) {
             finishStreamWithError(newStream, QNetworkReply::UnknownNetworkError,
-                                  QLatin1String("failed to send DATA frame(s)"));
+                                  "failed to send DATA frame(s)"_L1);
             sendRST_STREAM(newStreamID, INTERNAL_ERROR);
             markAsReset(newStreamID);
             deleteActiveStream(newStreamID);
@@ -616,8 +616,7 @@ void QHttp2ProtocolHandler::handleDATA()
         auto &stream = activeStreams[streamID];
 
         if (qint32(inboundFrame.payloadSize()) > stream.recvWindow) {
-            finishStreamWithError(stream, QNetworkReply::ProtocolFailure,
-                                  QLatin1String("flow control error"));
+            finishStreamWithError(stream, QNetworkReply::ProtocolFailure, "flow control error"_L1);
             sendRST_STREAM(streamID, FLOW_CONTROL_ERROR);
             markAsReset(streamID);
             deleteActiveStream(streamID);
@@ -891,7 +890,7 @@ void QHttp2ProtocolHandler::handleGOAWAY()
     // successful completion.
     if (errorCode == HTTP2_NO_ERROR) {
         error = QNetworkReply::ContentReSendError;
-        message = QLatin1String("Server stopped accepting new streams before this stream was established");
+        message = "Server stopped accepting new streams before this stream was established"_L1;
     }
 
     for (quint32 id = lastStreamID; id < nextID; id += 2) {
@@ -931,7 +930,7 @@ void QHttp2ProtocolHandler::handleWINDOW_UPDATE()
         auto &stream = activeStreams[streamID];
         if (!valid || sum_will_overflow(stream.sendWindow, delta)) {
             finishStreamWithError(stream, QNetworkReply::ProtocolFailure,
-                                  QLatin1String("invalid WINDOW_UPDATE delta"));
+                                  "invalid WINDOW_UPDATE delta"_L1);
             sendRST_STREAM(streamID, PROTOCOL_ERROR);
             markAsReset(streamID);
             deleteActiveStream(streamID);
@@ -986,7 +985,7 @@ void QHttp2ProtocolHandler::handleContinuedHEADERS()
                 // (these streams are in halfClosedLocal or open state) or
                 // remote-reserved streams from a server's PUSH_PROMISE.
                 finishStreamWithError(stream, QNetworkReply::ProtocolFailure,
-                                      QLatin1String("HEADERS on invalid stream"));
+                                      "HEADERS on invalid stream"_L1);
                 sendRST_STREAM(streamID, CANCEL);
                 markAsReset(streamID);
                 deleteActiveStream(streamID);
@@ -1077,7 +1076,7 @@ bool QHttp2ProtocolHandler::acceptSetting(Http2::Settings identifier, quint32 ne
         for (auto id : brokenStreams) {
             auto &stream = activeStreams[id];
             finishStreamWithError(stream, QNetworkReply::ProtocolFailure,
-                                  QLatin1String("SETTINGS window overflow"));
+                                  "SETTINGS window overflow"_L1);
             sendRST_STREAM(id, PROTOCOL_ERROR);
             markAsReset(id);
             deleteActiveStream(id);
@@ -1491,7 +1490,7 @@ void QHttp2ProtocolHandler::resumeSuspendedStreams()
         Stream &stream = activeStreams[streamID];
         if (!sendDATA(stream)) {
             finishStreamWithError(stream, QNetworkReply::UnknownNetworkError,
-                                  QLatin1String("failed to send DATA"));
+                                  "failed to send DATA"_L1);
             sendRST_STREAM(streamID, INTERNAL_ERROR);
             markAsReset(streamID);
             deleteActiveStream(streamID);
diff --git a/src/network/access/qhttpnetworkconnection.cpp b/src/network/access/qhttpnetworkconnection.cpp
index 3f7442b189..7d38638eb5 100644
--- a/src/network/access/qhttpnetworkconnection.cpp
+++ b/src/network/access/qhttpnetworkconnection.cpp
@@ -66,6 +66,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 const int QHttpNetworkConnectionPrivate::defaultHttpChannelCount = 6;
 
 // The pipeline length. So there will be 4 requests in flight.
@@ -318,12 +320,12 @@ void QHttpNetworkConnectionPrivate::prepareRequest(HttpMessagePair &messagePair)
     if (value.isEmpty()) {
         QString systemLocale = QLocale::system().name().replace(QChar::fromLatin1('_'),QChar::fromLatin1('-'));
         QString acceptLanguage;
-        if (systemLocale == QLatin1String("C"))
+        if (systemLocale == "C"_L1)
             acceptLanguage = QString::fromLatin1("en,*");
-        else if (systemLocale.startsWith(QLatin1String("en-")))
-            acceptLanguage = systemLocale + QLatin1String(",*");
+        else if (systemLocale.startsWith("en-"_L1))
+            acceptLanguage = systemLocale + ",*"_L1;
         else
-            acceptLanguage = systemLocale + QLatin1String(",en,*");
+            acceptLanguage = systemLocale + ",en,*"_L1;
         request.setHeaderField("Accept-Language", std::move(acceptLanguage).toLatin1());
     }
 
@@ -567,7 +569,7 @@ QHttpNetworkConnectionPrivate::parseRedirectResponse(QHttpNetworkReply *reply)
 
     // Check redirect url protocol
     const QUrl priorUrl(reply->request().url());
-    if (redirectUrl.scheme() == QLatin1String("http") || redirectUrl.scheme() == QLatin1String("https")) {
+    if (redirectUrl.scheme() == "http"_L1 || redirectUrl.scheme() == "https"_L1) {
         switch (reply->request().redirectPolicy()) {
         case QNetworkRequest::NoLessSafeRedirectPolicy:
             // Here we could handle https->http redirects as InsecureProtocolError.
diff --git a/src/network/access/qhttpnetworkreply.cpp b/src/network/access/qhttpnetworkreply.cpp
index d23dc1434f..af8a177819 100644
--- a/src/network/access/qhttpnetworkreply.cpp
+++ b/src/network/access/qhttpnetworkreply.cpp
@@ -50,6 +50,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QHttpNetworkReply::QHttpNetworkReply(const QUrl &url, QObject *parent)
     : QObject(*new QHttpNetworkReplyPrivate(url), parent)
 {
@@ -352,8 +354,7 @@ QHttpNetworkReplyPrivate::QHttpNetworkReplyPrivate(const QUrl &newUrl)
 
 {
     QString scheme = newUrl.scheme();
-    if (scheme == QLatin1String("preconnect-http")
-            || scheme == QLatin1String("preconnect-https"))
+    if (scheme == "preconnect-http"_L1 || scheme == "preconnect-https"_L1)
         // make sure we do not close the socket after preconnecting
         connectionCloseEnabled = false;
 }
diff --git a/src/network/access/qhttpprotocolhandler.cpp b/src/network/access/qhttpprotocolhandler.cpp
index 973c200736..ceff9fc7fd 100644
--- a/src/network/access/qhttpprotocolhandler.cpp
+++ b/src/network/access/qhttpprotocolhandler.cpp
@@ -44,6 +44,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QHttpProtocolHandler::QHttpProtocolHandler(QHttpNetworkConnectionChannel *channel)
     : QAbstractProtocolHandler(channel)
 {
@@ -273,8 +275,7 @@ bool QHttpProtocolHandler::sendRequest()
             return false;
         }
         QString scheme = m_channel->request.url().scheme();
-        if (scheme == QLatin1String("preconnect-http")
-            || scheme == QLatin1String("preconnect-https")) {
+        if (scheme == "preconnect-http"_L1 || scheme == "preconnect-https"_L1) {
             m_channel->state = QHttpNetworkConnectionChannel::IdleState;
             m_reply->d_func()->state = QHttpNetworkReplyPrivate::AllDoneState;
             m_channel->allDone();
diff --git a/src/network/access/qhttpthreaddelegate.cpp b/src/network/access/qhttpthreaddelegate.cpp
index 80ad5dfd42..94fa6e428c 100644
--- a/src/network/access/qhttpthreaddelegate.cpp
+++ b/src/network/access/qhttpthreaddelegate.cpp
@@ -52,6 +52,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 static QNetworkReply::NetworkError statusCodeFromHttp(int httpStatusCode, const QUrl &url)
 {
     QNetworkReply::NetworkError code;
@@ -128,14 +130,12 @@ static QByteArray makeCacheKey(QUrl &url, QNetworkProxy *proxy, const QString &p
     QString result;
     QUrl copy = url;
     QString scheme = copy.scheme();
-    bool isEncrypted = scheme == QLatin1String("https")
-                       || scheme == QLatin1String("preconnect-https");
+    bool isEncrypted = scheme == "https"_L1 || scheme == "preconnect-https"_L1;
     copy.setPort(copy.port(isEncrypted ? 443 : 80));
-    if (scheme == QLatin1String("preconnect-http")) {
-        copy.setScheme(QLatin1String("http"));
-    } else if (scheme == QLatin1String("preconnect-https")) {
-        copy.setScheme(QLatin1String("https"));
-    }
+    if (scheme == "preconnect-http"_L1)
+        copy.setScheme("http"_L1);
+    else if (scheme == "preconnect-https"_L1)
+        copy.setScheme("https"_L1);
     result = copy.toString(QUrl::RemoveUserInfo | QUrl::RemovePath |
                            QUrl::RemoveQuery | QUrl::RemoveFragment | QUrl::FullyEncoded);
 
@@ -145,12 +145,12 @@ static QByteArray makeCacheKey(QUrl &url, QNetworkProxy *proxy, const QString &p
 
         switch (proxy->type()) {
         case QNetworkProxy::Socks5Proxy:
-            key.setScheme(QLatin1String("proxy-socks5"));
+            key.setScheme("proxy-socks5"_L1);
             break;
 
         case QNetworkProxy::HttpProxy:
         case QNetworkProxy::HttpCachingProxy:
-            key.setScheme(QLatin1String("proxy-http"));
+            key.setScheme("proxy-http"_L1);
             break;
 
         default:
diff --git a/src/network/access/qnetworkaccessauthenticationmanager.cpp b/src/network/access/qnetworkaccessauthenticationmanager.cpp
index 7b2e439fe3..c651301e9c 100644
--- a/src/network/access/qnetworkaccessauthenticationmanager.cpp
+++ b/src/network/access/qnetworkaccessauthenticationmanager.cpp
@@ -51,6 +51,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 class QNetworkAuthenticationCache : private QList<QNetworkAuthenticationCredential>,
                                     public QNetworkAccessCache::CacheableObject
 {
@@ -105,16 +107,16 @@ static QByteArray proxyAuthenticationKey(const QNetworkProxy &proxy, const QStri
 
     switch (proxy.type()) {
     case QNetworkProxy::Socks5Proxy:
-        key.setScheme(QLatin1String("proxy-socks5"));
+        key.setScheme("proxy-socks5"_L1);
         break;
 
     case QNetworkProxy::HttpProxy:
     case QNetworkProxy::HttpCachingProxy:
-        key.setScheme(QLatin1String("proxy-http"));
+        key.setScheme("proxy-http"_L1);
         break;
 
     case QNetworkProxy::FtpCachingProxy:
-        key.setScheme(QLatin1String("proxy-ftp"));
+        key.setScheme("proxy-ftp"_L1);
         break;
 
     case QNetworkProxy::DefaultProxy:
diff --git a/src/network/access/qnetworkaccessdebugpipebackend.cpp b/src/network/access/qnetworkaccessdebugpipebackend.cpp
index 1dafc32060..c2987ac3d1 100644
--- a/src/network/access/qnetworkaccessdebugpipebackend.cpp
+++ b/src/network/access/qnetworkaccessdebugpipebackend.cpp
@@ -46,6 +46,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 #ifdef QT_BUILD_INTERNAL
 
 enum {
@@ -74,7 +76,7 @@ QNetworkAccessDebugPipeBackendFactory::create(QNetworkAccessManager::Operation o
     }
 
     QUrl url = request.url();
-    if (url.scheme() == QLatin1String("debugpipe"))
+    if (url.scheme() == "debugpipe"_L1)
         return new QNetworkAccessDebugPipeBackend;
     return nullptr;
 }
@@ -109,7 +111,7 @@ void QNetworkAccessDebugPipeBackend::open()
     // socket bytes written -> we can push more from upstream to socket
     connect(&socket, SIGNAL(bytesWritten(qint64)), SLOT(socketBytesWritten(qint64)));
 
-    bareProtocol = QUrlQuery(url()).queryItemValue(QLatin1String("bare")) == QLatin1String("1");
+    bareProtocol = QUrlQuery(url()).queryItemValue("bare"_L1) == "1"_L1;
 
     if (operation() == QNetworkAccessManager::PutOperation) {
         createUploadByteDevice();
diff --git a/src/network/access/qnetworkaccessfilebackend.cpp b/src/network/access/qnetworkaccessfilebackend.cpp
index 8f089bec3c..1fe74b79cb 100644
--- a/src/network/access/qnetworkaccessfilebackend.cpp
+++ b/src/network/access/qnetworkaccessfilebackend.cpp
@@ -47,6 +47,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QStringList QNetworkAccessFileBackendFactory::supportedSchemes() const
 {
     QStringList schemes;
@@ -74,9 +76,9 @@ QNetworkAccessFileBackendFactory::create(QNetworkAccessManager::Operation op,
     }
 
     QUrl url = request.url();
-    if (url.scheme().compare(QLatin1String("qrc"), Qt::CaseInsensitive) == 0
+    if (url.scheme().compare("qrc"_L1, Qt::CaseInsensitive) == 0
 #if defined(Q_OS_ANDROID)
-            || url.scheme().compare(QLatin1String("assets"), Qt::CaseInsensitive) == 0
+            || url.scheme().compare("assets"_L1, Qt::CaseInsensitive) == 0
 #endif
             || url.isLocalFile()) {
         return new QNetworkAccessFileBackend;
@@ -112,7 +114,7 @@ void QNetworkAccessFileBackend::open()
 {
     QUrl url = this->url();
 
-    if (url.host() == QLatin1String("localhost"))
+    if (url.host() == "localhost"_L1)
         url.setHost(QString());
 #if !defined(Q_OS_WIN)
     // do not allow UNC paths on Unix
@@ -125,17 +127,17 @@ void QNetworkAccessFileBackend::open()
     }
 #endif // !defined(Q_OS_WIN)
     if (url.path().isEmpty())
-        url.setPath(QLatin1String("/"));
+        url.setPath("/"_L1);
     setUrl(url);
 
     QString fileName = url.toLocalFile();
     if (fileName.isEmpty()) {
-        if (url.scheme() == QLatin1String("qrc")) {
+        if (url.scheme() == "qrc"_L1) {
             fileName = u':' + url.path();
         } else {
 #if defined(Q_OS_ANDROID)
-            if (url.scheme() == QLatin1String("assets"))
-                fileName = QLatin1String("assets:") + url.path();
+            if (url.scheme() == "assets"_L1)
+                fileName = "assets:"_L1 + url.path();
             else
 #endif
                 fileName = url.toString(QUrl::RemoveAuthority | QUrl::RemoveFragment | QUrl::RemoveQuery);
diff --git a/src/network/access/qnetworkaccessmanager.cpp b/src/network/access/qnetworkaccessmanager.cpp
index 29b6eddc80..be3165692f 100644
--- a/src/network/access/qnetworkaccessmanager.cpp
+++ b/src/network/access/qnetworkaccessmanager.cpp
@@ -100,14 +100,15 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 Q_APPLICATION_STATIC(QNetworkAccessFileBackendFactory, fileBackend)
 
 #ifdef QT_BUILD_INTERNAL
 Q_GLOBAL_STATIC(QNetworkAccessDebugPipeBackendFactory, debugpipeBackend)
 #endif
 
-Q_APPLICATION_STATIC(QFactoryLoader, loader, QNetworkAccessBackendFactory_iid,
-                     QLatin1String("/networkaccess"))
+Q_APPLICATION_STATIC(QFactoryLoader, loader, QNetworkAccessBackendFactory_iid, "/networkaccess"_L1)
 
 #if defined(Q_OS_MACOS)
 bool getProxyAuth(const QString& proxyHostname, const QString &scheme, QString& username, QString& password)
@@ -116,13 +117,13 @@ bool getProxyAuth(const QString& proxyHostname, const QString &scheme, QString&
     SecKeychainItemRef itemRef;
     bool retValue = false;
     SecProtocolType protocolType = kSecProtocolTypeAny;
-    if (scheme.compare(QLatin1String("ftp"),Qt::CaseInsensitive)==0) {
+    if (scheme.compare("ftp"_L1, Qt::CaseInsensitive) == 0) {
         protocolType = kSecProtocolTypeFTPProxy;
-    } else if (scheme.compare(QLatin1String("http"),Qt::CaseInsensitive)==0
-               || scheme.compare(QLatin1String("preconnect-http"),Qt::CaseInsensitive)==0) {
+    } else if (scheme.compare("http"_L1, Qt::CaseInsensitive) == 0
+               || scheme.compare("preconnect-http"_L1, Qt::CaseInsensitive) == 0) {
         protocolType = kSecProtocolTypeHTTPProxy;
-    } else if (scheme.compare(QLatin1String("https"),Qt::CaseInsensitive)==0
-               || scheme.compare(QLatin1String("preconnect-https"),Qt::CaseInsensitive)==0) {
+    } else if (scheme.compare("https"_L1,Qt::CaseInsensitive)==0
+               || scheme.compare("preconnect-https"_L1, Qt::CaseInsensitive) == 0) {
         protocolType = kSecProtocolTypeHTTPSProxy;
     }
     QByteArray proxyHostnameUtf8(proxyHostname.toUtf8());
@@ -978,7 +979,7 @@ void QNetworkAccessManager::connectToHostEncrypted(const QString &hostName, quin
     QUrl url;
     url.setHost(hostName);
     url.setPort(port);
-    url.setScheme(QLatin1String("preconnect-https"));
+    url.setScheme("preconnect-https"_L1);
     QNetworkRequest request(url);
     if (sslConfiguration != QSslConfiguration::defaultConfiguration())
         request.setSslConfiguration(sslConfiguration);
@@ -1009,7 +1010,7 @@ void QNetworkAccessManager::connectToHost(const QString &hostName, quint16 port)
     QUrl url;
     url.setHost(hostName);
     url.setPort(port);
-    url.setScheme(QLatin1String("preconnect-http"));
+    url.setScheme("preconnect-http"_L1);
     QNetworkRequest request(url);
     get(request);
 }
@@ -1164,13 +1165,13 @@ QNetworkReply *QNetworkAccessManager::createRequest(QNetworkAccessManager::Opera
      || op == QNetworkAccessManager::HeadOperation) {
         if (isLocalFile
 #ifdef Q_OS_ANDROID
-            || scheme == QLatin1String("assets")
+            || scheme == "assets"_L1
 #endif
-            || scheme == QLatin1String("qrc")) {
+            || scheme == "qrc"_L1) {
             return new QNetworkReplyFileImpl(this, req, op);
         }
 
-        if (scheme == QLatin1String("data"))
+        if (scheme == "data"_L1)
             return new QNetworkReplyDataImpl(this, req, op);
 
         // A request with QNetworkRequest::AlwaysCache does not need any bearer management
@@ -1212,7 +1213,7 @@ QNetworkReply *QNetworkAccessManager::createRequest(QNetworkAccessManager::Opera
 #ifdef Q_OS_WASM
     Q_UNUSED(isLocalFile);
     // Support http, https, and relative urls
-    if (scheme == QLatin1String("http") || scheme == QLatin1String("https") || scheme.isEmpty()) {
+    if (scheme == "http"_L1 || scheme == "https"_L1 || scheme.isEmpty()) {
         QNetworkReplyWasmImpl *reply = new QNetworkReplyWasmImpl(this);
         QNetworkReplyWasmImplPrivate *priv = reply->d_func();
         priv->manager = this;
@@ -1246,7 +1247,7 @@ QNetworkReply *QNetworkAccessManager::createRequest(QNetworkAccessManager::Opera
             // MUST NOT add one.
             if (stsUrl.port() == 80)
                 stsUrl.setPort(443);
-            stsUrl.setScheme(QLatin1String("https"));
+            stsUrl.setScheme("https"_L1);
             request.setUrl(stsUrl);
         }
 #endif
diff --git a/src/network/access/qnetworkcookie.cpp b/src/network/access/qnetworkcookie.cpp
index b9826fe1ed..d841c5304a 100644
--- a/src/network/access/qnetworkcookie.cpp
+++ b/src/network/access/qnetworkcookie.cpp
@@ -537,7 +537,7 @@ QByteArray QNetworkCookie::toRawForm(RawForm form) const
         if (!isSessionCookie()) {
             result += "; expires=";
             result += QLocale::c().toString(d->expirationDate.toUTC(),
-                                            QLatin1String("ddd, dd-MMM-yyyy hh:mm:ss 'GMT")).toLatin1();
+                                            "ddd, dd-MMM-yyyy hh:mm:ss 'GMT"_L1).toLatin1();
         }
         if (!d->domain.isEmpty()) {
             result += "; domain=";
@@ -759,7 +759,7 @@ static QDateTime parseDateString(const QByteArray &dateString)
                 int ms = match.capturedView(4).toInt();
                 QStringView ampm = match.capturedView(5);
                 if (h < 12 && !ampm.isEmpty())
-                    if (ampm == QLatin1String("pm"))
+                    if (ampm == "pm"_L1)
                         h += 12;
                 time = QTime(h, m, s, ms);
 #ifdef PARSEDATESTRINGDEBUG
diff --git a/src/network/access/qnetworkcookiejar.cpp b/src/network/access/qnetworkcookiejar.cpp
index de2449279a..38a29144e6 100644
--- a/src/network/access/qnetworkcookiejar.cpp
+++ b/src/network/access/qnetworkcookiejar.cpp
@@ -57,6 +57,8 @@ QT_END_NAMESPACE
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 /*!
     \class QNetworkCookieJar
     \since 4.4
@@ -148,7 +150,7 @@ void QNetworkCookieJar::setAllCookies(const QList<QNetworkCookie> &cookieList)
 
 static inline bool isParentPath(const QString &path, const QString &reference)
 {
-    if ((path.isEmpty() && reference == QLatin1String("/")) || path.startsWith(reference)) {
+    if ((path.isEmpty() && reference == "/"_L1) || path.startsWith(reference)) {
         //The cookie-path and the request-path are identical.
         if (path.length() == reference.length())
             return true;
@@ -234,7 +236,7 @@ QList<QNetworkCookie> QNetworkCookieJar::cookiesForUrl(const QUrl &url) const
     Q_D(const QNetworkCookieJar);
     const QDateTime now = QDateTime::currentDateTimeUtc();
     QList<QNetworkCookie> result;
-    bool isEncrypted = url.scheme() == QLatin1String("https");
+    bool isEncrypted = url.scheme() == "https"_L1;
 
     // scan our cookies for something that matches
     QList<QNetworkCookie>::ConstIterator it = d->allCookies.constBegin(),
diff --git a/src/network/access/qnetworkdiskcache.cpp b/src/network/access/qnetworkdiskcache.cpp
index 6abb92a8a0..78bd4f4e7e 100644
--- a/src/network/access/qnetworkdiskcache.cpp
+++ b/src/network/access/qnetworkdiskcache.cpp
@@ -56,15 +56,17 @@
 
 #include <memory>
 
-#define CACHE_POSTFIX QLatin1String(".d")
-#define PREPARED_SLASH QLatin1String("prepared/")
+#define CACHE_POSTFIX ".d"_L1
+#define PREPARED_SLASH "prepared/"_L1
 #define CACHE_VERSION 8
-#define DATA_DIR QLatin1String("data")
+#define DATA_DIR "data"_L1
 
 #define MAX_COMPRESSION_SIZE (1024 * 1024 * 3)
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 /*!
     \class QNetworkDiskCache
     \since 4.5
@@ -606,7 +608,7 @@ QString QNetworkDiskCachePrivate::uniqueFileName(const QUrl &url)
 QString QNetworkDiskCachePrivate::tmpCacheFileName() const
 {
     //The subdirectory is presumed to be already read for use.
-    return cacheDirectory + PREPARED_SLASH + QLatin1String("XXXXXX") + CACHE_POSTFIX;
+    return cacheDirectory + PREPARED_SLASH + "XXXXXX"_L1 + CACHE_POSTFIX;
 }
 
 /*!
diff --git a/src/network/access/qnetworkreplyfileimpl.cpp b/src/network/access/qnetworkreplyfileimpl.cpp
index 319325df09..d62a3aec29 100644
--- a/src/network/access/qnetworkreplyfileimpl.cpp
+++ b/src/network/access/qnetworkreplyfileimpl.cpp
@@ -49,6 +49,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QT_IMPL_METATYPE_EXTERN_TAGGED(QNetworkRequest::KnownHeaders, QNetworkRequest__KnownHeaders)
 
 QNetworkReplyFileImplPrivate::QNetworkReplyFileImplPrivate()
@@ -82,7 +84,7 @@ QNetworkReplyFileImpl::QNetworkReplyFileImpl(QNetworkAccessManager *manager, con
     d->managerPrivate = manager->d_func();
 
     QUrl url = req.url();
-    if (url.host() == QLatin1String("localhost"))
+    if (url.host() == "localhost"_L1)
         url.setHost(QString());
 
 #if !defined(Q_OS_WIN)
@@ -98,18 +100,18 @@ QNetworkReplyFileImpl::QNetworkReplyFileImpl(QNetworkAccessManager *manager, con
     }
 #endif
     if (url.path().isEmpty())
-        url.setPath(QLatin1String("/"));
+        url.setPath("/"_L1);
     setUrl(url);
 
     QString fileName = url.toLocalFile();
     if (fileName.isEmpty()) {
         const QString scheme = url.scheme();
-        if (scheme == QLatin1String("qrc")) {
+        if (scheme == "qrc"_L1) {
             fileName = u':' + url.path();
         } else {
 #if defined(Q_OS_ANDROID)
-            if (scheme == QLatin1String("assets"))
-                fileName = QLatin1String("assets:") + url.path();
+            if (scheme == "assets"_L1)
+                fileName = "assets:"_L1 + url.path();
             else
 #endif
                 fileName = url.toString(QUrl::RemoveAuthority | QUrl::RemoveFragment | QUrl::RemoveQuery);
@@ -224,7 +226,7 @@ qint64 QNetworkReplyFileImpl::readData(char *data, qint64 maxlen)
         return -1;
     else {
         setAttribute(QNetworkRequest::HttpStatusCodeAttribute, 200);
-        setAttribute(QNetworkRequest::HttpReasonPhraseAttribute, QLatin1String("OK"));
+        setAttribute(QNetworkRequest::HttpReasonPhraseAttribute, "OK"_L1);
         return ret;
     }
 }
diff --git a/src/network/access/qnetworkreplyhttpimpl.cpp b/src/network/access/qnetworkreplyhttpimpl.cpp
index 157b86b52e..3612fe301d 100644
--- a/src/network/access/qnetworkreplyhttpimpl.cpp
+++ b/src/network/access/qnetworkreplyhttpimpl.cpp
@@ -67,6 +67,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 class QNetworkProxy;
 
 static inline bool isSeparator(char c)
@@ -182,7 +184,7 @@ QNetworkReplyHttpImpl::QNetworkReplyHttpImpl(QNetworkAccessManager* const manage
     d->outgoingData = outgoingData;
     d->url = request.url();
 #ifndef QT_NO_SSL
-    if (request.url().scheme() == QLatin1String("https"))
+    if (request.url().scheme() == "https"_L1)
         d->sslConfiguration.reset(new QSslConfiguration(request.sslConfiguration()));
 #endif
 
@@ -658,13 +660,11 @@ void QNetworkReplyHttpImplPrivate::postRequest(const QNetworkRequest &newHttpReq
     httpRequest.setRedirectCount(newHttpRequest.maximumRedirectsAllowed());
 
     QString scheme = url.scheme();
-    bool ssl = (scheme == QLatin1String("https")
-                || scheme == QLatin1String("preconnect-https"));
+    bool ssl = (scheme == "https"_L1 || scheme == "preconnect-https"_L1);
     q->setAttribute(QNetworkRequest::ConnectionEncryptedAttribute, ssl);
     httpRequest.setSsl(ssl);
 
-    bool preConnect = (scheme == QLatin1String("preconnect-http")
-                       || scheme == QLatin1String("preconnect-https"));
+    bool preConnect = (scheme == "preconnect-http"_L1 || scheme == "preconnect-https"_L1);
     httpRequest.setPreConnect(preConnect);
 
 #ifndef QT_NO_NETWORKPROXY
@@ -1235,13 +1235,12 @@ void QNetworkReplyHttpImplPrivate::onRedirected(const QUrl &redirectUrl, int htt
         // equal to "80", the port component value MUST be preserved;
         // otherwise, if the URI does not contain an explicit port
         // component, the UA MUST NOT add one.
-        url.setScheme(QLatin1String("https"));
+        url.setScheme("https"_L1);
         if (url.port() == 80)
             url.setPort(443);
     }
 
-    const bool isLessSafe = schemeBefore == QLatin1String("https")
-                            && url.scheme() == QLatin1String("http");
+    const bool isLessSafe = schemeBefore == "https"_L1 && url.scheme() == "http"_L1;
     if (httpRequest.redirectPolicy() == QNetworkRequest::NoLessSafeRedirectPolicy
         && isLessSafe) {
         error(QNetworkReply::InsecureRedirectError,
@@ -1341,7 +1340,7 @@ void QNetworkReplyHttpImplPrivate::replyDownloadMetaData(const QList<QPair<QByte
     // RFC6797, 8.1
     // If an HTTP response is received over insecure transport, the UA MUST
     // ignore any present STS header field(s).
-    if (url.scheme() == QLatin1String("https") && managerPrivate->stsEnabled)
+    if (url.scheme() == "https"_L1 && managerPrivate->stsEnabled)
         managerPrivate->stsCache.updateFromHeaders(hm, url);
 #endif
     // Download buffer
diff --git a/src/network/access/qnetworkrequest.cpp b/src/network/access/qnetworkrequest.cpp
index 5734ac0dc5..3d89453cdb 100644
--- a/src/network/access/qnetworkrequest.cpp
+++ b/src/network/access/qnetworkrequest.cpp
@@ -59,6 +59,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QT_IMPL_METATYPE_EXTERN(QNetworkRequest)
 QT_IMPL_METATYPE_EXTERN_TAGGED(QNetworkRequest::RedirectPolicy, QNetworkRequest__RedirectPolicy)
 
@@ -1512,7 +1514,7 @@ QDateTime QNetworkHeadersPrivate::fromHttpDate(const QByteArray &value)
             // eat the weekday, the comma and the space following it
             QString sansWeekday = QString::fromLatin1(value.constData() + pos + 2);
             // must be RFC 850 date
-            dt = c.toDateTime(sansWeekday, QLatin1String("dd-MMM-yy hh:mm:ss 'GMT'"));
+            dt = c.toDateTime(sansWeekday, "dd-MMM-yy hh:mm:ss 'GMT'"_L1);
         }
     }
 #endif // datestring
diff --git a/src/network/doc/snippets/code/src_network_access_qnetworkreply.cpp b/src/network/doc/snippets/code/src_network_access_qnetworkreply.cpp
index 3ac98302b6..6ebc3dcd29 100644
--- a/src/network/doc/snippets/code/src_network_access_qnetworkreply.cpp
+++ b/src/network/doc/snippets/code/src_network_access_qnetworkreply.cpp
@@ -48,8 +48,10 @@
 **
 ****************************************************************************/
 
+using namespace Qt::StringLiterals;
+
 //! [0]
-QList<QSslCertificate> cert = QSslCertificate::fromPath(QLatin1String("server-certificate.pem"));
+QList<QSslCertificate> cert = QSslCertificate::fromPath("server-certificate.pem"_L1);
 QSslError error(QSslError::SelfSignedCertificate, cert.at(0));
 QList<QSslError> expectedSslErrors;
 expectedSslErrors.append(error);
diff --git a/src/network/doc/snippets/code/src_network_ssl_qdtls.cpp b/src/network/doc/snippets/code/src_network_ssl_qdtls.cpp
index 2132b48338..b4b28a7348 100644
--- a/src/network/doc/snippets/code/src_network_ssl_qdtls.cpp
+++ b/src/network/doc/snippets/code/src_network_ssl_qdtls.cpp
@@ -48,6 +48,7 @@
 **
 ****************************************************************************/
 
+using namespace Qt::StringLiterals;
 //! [0]
 // A client initiates a handshake:
 QUdpSocket clientSocket;
@@ -126,7 +127,7 @@ if (!dtls.doHandshake(&socket, dgram)) {
 //! [5]
 
 //! [6]
-QList<QSslCertificate> cert = QSslCertificate::fromPath(QLatin1String("server-certificate.pem"));
+QList<QSslCertificate> cert = QSslCertificate::fromPath("server-certificate.pem"_L1);
 QSslError error(QSslError::SelfSignedCertificate, cert.at(0));
 QList<QSslError> expectedSslErrors;
 expectedSslErrors.append(error);
diff --git a/src/network/doc/snippets/code/src_network_ssl_qsslsocket.cpp b/src/network/doc/snippets/code/src_network_ssl_qsslsocket.cpp
index c1b3ceaf69..16cf7d6fe3 100644
--- a/src/network/doc/snippets/code/src_network_ssl_qsslsocket.cpp
+++ b/src/network/doc/snippets/code/src_network_ssl_qsslsocket.cpp
@@ -48,6 +48,8 @@
 **
 ****************************************************************************/
 
+using namespace Qt::StringLiterals;
+
 //! [0]
 QSslSocket *socket = new QSslSocket(this);
 connect(socket, SIGNAL(encrypted()), this, SLOT(ready()));
@@ -107,7 +109,7 @@ if (socket->waitForEncrypted(1000))
 //! [5]
 
 //! [6]
-QList<QSslCertificate> cert = QSslCertificate::fromPath(QLatin1String("server-certificate.pem"));
+QList<QSslCertificate> cert = QSslCertificate::fromPath("server-certificate.pem"_L1);
 QSslError error(QSslError::SelfSignedCertificate, cert.at(0));
 QList<QSslError> expectedSslErrors;
 expectedSslErrors.append(error);
diff --git a/src/network/kernel/qauthenticator.cpp b/src/network/kernel/qauthenticator.cpp
index 90b9c42057..45dacd5f04 100644
--- a/src/network/kernel/qauthenticator.cpp
+++ b/src/network/kernel/qauthenticator.cpp
@@ -69,6 +69,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 Q_DECLARE_LOGGING_CATEGORY(lcAuthenticator);
 Q_LOGGING_CATEGORY(lcAuthenticator, "qt.network.authenticator");
 
@@ -405,7 +407,7 @@ void QAuthenticatorPrivate::updateCredentials()
 
     switch (method) {
     case QAuthenticatorPrivate::Ntlm:
-        if ((separatorPosn = user.indexOf(QLatin1String("\\"))) != -1) {
+        if ((separatorPosn = user.indexOf("\\"_L1)) != -1) {
             //domain name is present
             realm.clear();
             userDomain = user.left(separatorPosn);
@@ -522,7 +524,7 @@ void QAuthenticatorPrivate::parseHttpResponse(const QList<QPair<QByteArray, QByt
             if (phase == Done)
                 phase = Start;
             realm = newRealm;
-            this->options[QLatin1String("realm")] = realm;
+            this->options["realm"_L1] = realm;
         }
     };
 
@@ -1658,7 +1660,7 @@ static QByteArray qSspiContinue(QAuthenticatorPrivate *ctx, QAuthenticatorPrivat
 
     // Calculate target (SPN for Negotiate, empty for NTLM)
     std::wstring targetNameW = (method == QAuthenticatorPrivate::Negotiate
-                                ? QLatin1String("HTTP/") + host : QString()).toStdWString();
+                                ? "HTTP/"_L1 + host : QString()).toStdWString();
 
     // Generate our challenge-response message
     SECURITY_STATUS secStatus = pSecurityFunctionTable->InitializeSecurityContext(
diff --git a/src/network/kernel/qdnslookup_unix.cpp b/src/network/kernel/qdnslookup_unix.cpp
index 1449c32937..545b8cca86 100644
--- a/src/network/kernel/qdnslookup_unix.cpp
+++ b/src/network/kernel/qdnslookup_unix.cpp
@@ -67,6 +67,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 #if QT_CONFIG(library)
 
 #if defined(Q_OS_OPENBSD)
@@ -111,7 +113,7 @@ static bool resolveLibraryInternal()
     if (!lib.load())
 #endif
     {
-        lib.setFileName(QLatin1String("resolv"));
+        lib.setFileName("resolv"_L1);
         lib.load();
     }
 
diff --git a/src/network/kernel/qhostinfo.cpp b/src/network/kernel/qhostinfo.cpp
index 4ec1a06f59..86ff8f5e0b 100644
--- a/src/network/kernel/qhostinfo.cpp
+++ b/src/network/kernel/qhostinfo.cpp
@@ -70,6 +70,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 //#define QHOSTINFO_DEBUG
 
 QT_IMPL_METATYPE_EXTERN(QHostInfo)
@@ -536,7 +538,7 @@ QHostInfo QHostInfoAgent::lookup(const QString &hostName)
         QString tmp;
         QList<QHostAddress> addresses = results.addresses();
         for (int i = 0; i < addresses.count(); ++i) {
-            if (i != 0) tmp += QLatin1String(", ");
+            if (i != 0) tmp += ", "_L1;
             tmp += addresses.at(i).toString();
         }
         qDebug("QHostInfoAgent::fromName(): found %i entries for \"%s\": {%s}",
diff --git a/src/network/kernel/qhostinfo_unix.cpp b/src/network/kernel/qhostinfo_unix.cpp
index eb1048a42a..fe225f2e5d 100644
--- a/src/network/kernel/qhostinfo_unix.cpp
+++ b/src/network/kernel/qhostinfo_unix.cpp
@@ -74,6 +74,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 enum LibResolvFeature {
     NeedResInit,
     NeedResNInit
@@ -129,7 +131,7 @@ LibResolv::LibResolv()
     if (!lib.load())
 #endif
     {
-        lib.setFileName(QLatin1String("resolv"));
+        lib.setFileName("resolv"_L1);
         lib.load();
     }
 
@@ -228,7 +230,7 @@ QString QHostInfo::localDomainName()
 #if defined(_PATH_RESCONF)
     resolvconf.setFileName(QFile::decodeName(_PATH_RESCONF));
 #else
-    resolvconf.setFileName(QLatin1String("/etc/resolv.conf"));
+    resolvconf.setFileName("/etc/resolv.conf"_L1);
 #endif
     if (!resolvconf.open(QIODevice::ReadOnly))
         return QString();       // failure
diff --git a/src/network/kernel/qnetworkproxy.cpp b/src/network/kernel/qnetworkproxy.cpp
index 29dc9d2e14..141a61ecdd 100644
--- a/src/network/kernel/qnetworkproxy.cpp
+++ b/src/network/kernel/qnetworkproxy.cpp
@@ -243,6 +243,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QT_IMPL_METATYPE_EXTERN(QNetworkProxy)
 
 class QSocks5SocketEngineHandler;
@@ -356,10 +358,8 @@ QList<QNetworkProxy> QGlobalNetworkProxy::proxyForQuery(const QNetworkProxyQuery
     // don't look for proxies for a local connection
     QHostAddress parsed;
     QString hostname = query.url().host();
-    if (hostname == QLatin1String("localhost")
-        || hostname.startsWith(QLatin1String("localhost."))
-        || (parsed.setAddress(hostname)
-            && (parsed.isLoopback()))) {
+    if (hostname == "localhost"_L1 || hostname.startsWith("localhost."_L1)
+            || (parsed.setAddress(hostname) && (parsed.isLoopback()))) {
         result << QNetworkProxy(QNetworkProxy::NoProxy);
         return result;
     }
diff --git a/src/network/kernel/qnetworkproxy_generic.cpp b/src/network/kernel/qnetworkproxy_generic.cpp
index d2c7b29bc4..87b3e4d653 100644
--- a/src/network/kernel/qnetworkproxy_generic.cpp
+++ b/src/network/kernel/qnetworkproxy_generic.cpp
@@ -51,6 +51,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 static bool ignoreProxyFor(const QNetworkProxyQuery &query)
 {
     const QByteArray noProxy = qgetenv("no_proxy").trimmed();
@@ -101,11 +103,11 @@ QList<QNetworkProxy> QNetworkProxyFactory::systemProxyForQuery(const QNetworkPro
     const QString queryProtocol = query.protocolTag();
     QByteArray proxy_env;
 
-    if (queryProtocol == QLatin1String("http"))
+    if (queryProtocol == "http"_L1)
         proxy_env = qgetenv("http_proxy");
-    else if (queryProtocol == QLatin1String("https"))
+    else if (queryProtocol == "https"_L1)
         proxy_env = qgetenv("https_proxy");
-    else if (queryProtocol == QLatin1String("ftp"))
+    else if (queryProtocol == "ftp"_L1)
         proxy_env = qgetenv("ftp_proxy");
     else
         proxy_env = qgetenv("all_proxy");
@@ -117,16 +119,16 @@ QList<QNetworkProxy> QNetworkProxyFactory::systemProxyForQuery(const QNetworkPro
     if (!proxy_env.isEmpty()) {
         QUrl url = QUrl(QString::fromLocal8Bit(proxy_env));
         const QString scheme = url.scheme();
-        if (scheme == QLatin1String("socks5")) {
+        if (scheme == "socks5"_L1) {
             QNetworkProxy proxy(QNetworkProxy::Socks5Proxy, url.host(),
                     url.port() ? url.port() : 1080, url.userName(), url.password());
             proxyList << proxy;
-        } else if (scheme == QLatin1String("socks5h")) {
+        } else if (scheme == "socks5h"_L1) {
             QNetworkProxy proxy(QNetworkProxy::Socks5Proxy, url.host(),
                     url.port() ? url.port() : 1080, url.userName(), url.password());
             proxy.setCapabilities(QNetworkProxy::HostNameLookupCapability);
             proxyList << proxy;
-        } else if ((scheme.isEmpty() || scheme == QLatin1String("http"))
+        } else if ((scheme.isEmpty() || scheme == "http"_L1)
                   && query.queryType() != QNetworkProxyQuery::UdpSocket
                   && query.queryType() != QNetworkProxyQuery::TcpServer) {
             QNetworkProxy proxy(QNetworkProxy::HttpProxy, url.host(),
diff --git a/src/network/kernel/qnetworkproxy_libproxy.cpp b/src/network/kernel/qnetworkproxy_libproxy.cpp
index 29d2a0bd3b..c3a0e90ace 100644
--- a/src/network/kernel/qnetworkproxy_libproxy.cpp
+++ b/src/network/kernel/qnetworkproxy_libproxy.cpp
@@ -54,6 +54,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 static bool isThreadingNeeded()
 {
     // Try to guess if the libproxy we linked to is from the libproxy project
@@ -221,14 +223,13 @@ QList<QNetworkProxy> QNetworkProxyFactory::systemProxyForQuery(const QNetworkPro
     for (const QUrl& url : rawProxies) {
         QNetworkProxy::ProxyType type;
         const QString scheme = url.scheme();
-        if (scheme == QLatin1String("http")) {
+        if (scheme == "http"_L1) {
             type = QNetworkProxy::HttpProxy;
-        } else if (scheme == QLatin1String("socks")
-              || scheme == QLatin1String("socks5")) {
+        } else if (scheme == "socks"_L1 || scheme == "socks5"_L1) {
             type = QNetworkProxy::Socks5Proxy;
-        } else if (scheme == QLatin1String("ftp")) {
+        } else if (scheme == "ftp"_L1) {
             type = QNetworkProxy::FtpCachingProxy;
-        } else if (scheme == QLatin1String("direct")) {
+        } else if (scheme == "direct"_L1) {
             type = QNetworkProxy::NoProxy;
             haveDirectConnection = true;
         } else {
diff --git a/src/network/kernel/qnetworkproxy_mac.cpp b/src/network/kernel/qnetworkproxy_mac.cpp
index 2631de89ef..b034a8ce1c 100644
--- a/src/network/kernel/qnetworkproxy_mac.cpp
+++ b/src/network/kernel/qnetworkproxy_mac.cpp
@@ -78,6 +78,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 static bool isHostExcluded(CFDictionaryRef dict, const QString &host)
 {
     if (host.isEmpty())
@@ -292,19 +294,19 @@ QList<QNetworkProxy> macQueryInternal(const QNetworkProxyQuery &query)
 
     // try the protocol-specific proxy
     QNetworkProxy protocolSpecificProxy;
-    if (protocol == QLatin1String("ftp")) {
+    if (protocol == "ftp"_L1) {
         protocolSpecificProxy =
             proxyFromDictionary(dict, QNetworkProxy::FtpCachingProxy,
                                 kSCPropNetProxiesFTPEnable,
                                 kSCPropNetProxiesFTPProxy,
                                 kSCPropNetProxiesFTPPort);
-    } else if (protocol == QLatin1String("http")) {
+    } else if (protocol == "http"_L1) {
         protocolSpecificProxy =
             proxyFromDictionary(dict, QNetworkProxy::HttpProxy,
                                 kSCPropNetProxiesHTTPEnable,
                                 kSCPropNetProxiesHTTPProxy,
                                 kSCPropNetProxiesHTTPPort);
-    } else if (protocol == QLatin1String("https")) {
+    } else if (protocol == "https"_L1) {
         isHttps = true;
         protocolSpecificProxy =
             proxyFromDictionary(dict, QNetworkProxy::HttpProxy,
diff --git a/src/network/kernel/qnetworkproxy_win.cpp b/src/network/kernel/qnetworkproxy_win.cpp
index 272aac6b1e..53882613f6 100644
--- a/src/network/kernel/qnetworkproxy_win.cpp
+++ b/src/network/kernel/qnetworkproxy_win.cpp
@@ -57,6 +57,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 static bool currentProcessIsService()
 {
     wchar_t userName[UNLEN + 1] = L"";
@@ -119,7 +121,7 @@ static bool isBypassed(const QString &host, const QStringList &bypassList)
 
     // does it match the list of exclusions?
     for (const QString &entry : bypassList) {
-        if (entry == QLatin1String("<local>")) {
+        if (entry == "<local>"_L1) {
             if (isSimple)
                 return true;
             if (isIpAddress) {
@@ -231,20 +233,20 @@ static QList<QNetworkProxy> parseServerList(const QNetworkProxyQuery &query, con
             scheme = protocolTag = QStringView{entry}.left(pos);
             server = pos + 1;
         }
-        pos = entry.indexOf(QLatin1String("://"), server);
+        pos = entry.indexOf("://"_L1, server);
         if (pos != -1) {
             scheme = QStringView{entry}.mid(server, pos - server);
             server = pos + 3;
         }
 
         if (!scheme.isEmpty()) {
-            if (scheme == QLatin1String("http") || scheme == QLatin1String("https")) {
+            if (scheme == "http"_L1 || scheme == "https"_L1) {
                 // no-op
                 // defaults are above
-            } else if (scheme == QLatin1String("socks") || scheme == QLatin1String("socks5")) {
+            } else if (scheme == "socks"_L1 || scheme == "socks5"_L1) {
                 proxyType = QNetworkProxy::Socks5Proxy;
                 port = 1080;
-            } else if (scheme == QLatin1String("ftp")) {
+            } else if (scheme == "ftp"_L1) {
                 proxyType = QNetworkProxy::FtpCachingProxy;
                 port = 2121;
             } else {
@@ -279,10 +281,10 @@ static QList<QNetworkProxy> parseServerList(const QNetworkProxyQuery &query, con
             result.prepend(taggedProxies.value(requiredTag));
         }
     }
-    if (!checkTags || requiredTag != QLatin1String("http")) {
+    if (!checkTags || requiredTag != "http"_L1) {
         // if there are different http proxies for http and https, prefer the https one (more likely to be capable of CONNECT)
-        QNetworkProxy httpProxy = taggedProxies.value(QLatin1String("http"));
-        QNetworkProxy httpsProxy = taggedProxies.value(QLatin1String("http"));
+        QNetworkProxy httpProxy = taggedProxies.value("http"_L1);
+        QNetworkProxy httpsProxy = taggedProxies.value("http"_L1);
         if (httpProxy != httpsProxy && httpProxy.type() == QNetworkProxy::HttpProxy && httpsProxy.type() == QNetworkProxy::HttpProxy) {
             for (int i = 0; i < result.count(); i++) {
                 if (httpProxy == result.at(i))
@@ -504,11 +506,11 @@ QList<QNetworkProxy> QNetworkProxyFactory::systemProxyForQuery(const QNetworkPro
         // url could be empty, e.g. from QNetworkProxy::applicationProxy(), that's fine,
         // we'll still ask for the proxy.
         // But for a file url, we know we don't need one.
-        if (url.scheme() == QLatin1String("file") || url.scheme() == QLatin1String("qrc"))
+        if (url.scheme() == "file"_L1 || url.scheme() == "qrc"_L1)
             return sp->defaultResult;
         if (query.queryType() != QNetworkProxyQuery::UrlRequest) {
             // change the scheme to https, maybe it'll work
-            url.setScheme(QLatin1String("https"));
+            url.setScheme("https"_L1);
         }
 
         QString urlQueryString = url.toString();
diff --git a/src/network/socket/qabstractsocket.cpp b/src/network/socket/qabstractsocket.cpp
index 7a3829e719..f4e4af462e 100644
--- a/src/network/socket/qabstractsocket.cpp
+++ b/src/network/socket/qabstractsocket.cpp
@@ -500,6 +500,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QT_IMPL_METATYPE_EXTERN_TAGGED(QAbstractSocket::SocketState, QAbstractSocket__SocketState)
 QT_IMPL_METATYPE_EXTERN_TAGGED(QAbstractSocket::SocketError, QAbstractSocket__SocketError)
 
@@ -576,14 +578,14 @@ bool QAbstractSocketPrivate::initSocketLayer(QAbstractSocket::NetworkLayerProtoc
     Q_Q(QAbstractSocket);
 #if defined (QABSTRACTSOCKET_DEBUG)
     QString typeStr;
-    if (q->socketType() == QAbstractSocket::TcpSocket) typeStr = QLatin1String("TcpSocket");
-    else if (q->socketType() == QAbstractSocket::UdpSocket) typeStr = QLatin1String("UdpSocket");
-    else if (q->socketType() == QAbstractSocket::SctpSocket) typeStr = QLatin1String("SctpSocket");
-    else typeStr = QLatin1String("UnknownSocketType");
+    if (q->socketType() == QAbstractSocket::TcpSocket) typeStr = "TcpSocket"_L1;
+    else if (q->socketType() == QAbstractSocket::UdpSocket) typeStr = "UdpSocket"_L1;
+    else if (q->socketType() == QAbstractSocket::SctpSocket) typeStr = "SctpSocket"_L1;
+    else typeStr = "UnknownSocketType"_L1;
     QString protocolStr;
-    if (protocol == QAbstractSocket::IPv4Protocol) protocolStr = QLatin1String("IPv4Protocol");
-    else if (protocol == QAbstractSocket::IPv6Protocol) protocolStr = QLatin1String("IPv6Protocol");
-    else protocolStr = QLatin1String("UnknownNetworkLayerProtocol");
+    if (protocol == QAbstractSocket::IPv4Protocol) protocolStr = "IPv4Protocol"_L1;
+    else if (protocol == QAbstractSocket::IPv6Protocol) protocolStr = "IPv6Protocol"_L1;
+    else protocolStr = "UnknownNetworkLayerProtocol"_L1;
 #endif
 
     resetSocketLayer();
@@ -969,9 +971,9 @@ void QAbstractSocketPrivate::_q_startConnecting(const QHostInfo &hostInfo)
 
 
 #if defined(QABSTRACTSOCKET_DEBUG)
-    QString s = QLatin1String("{");
+    QString s = "{"_L1;
     for (int i = 0; i < addresses.count(); ++i) {
-        if (i != 0) s += QLatin1String(", ");
+        if (i != 0) s += ", "_L1;
         s += addresses.at(i).toString();
     }
     s += u'}';
diff --git a/src/network/socket/qhttpsocketengine.cpp b/src/network/socket/qhttpsocketengine.cpp
index 51ecf9b362..8c13538b77 100644
--- a/src/network/socket/qhttpsocketengine.cpp
+++ b/src/network/socket/qhttpsocketengine.cpp
@@ -51,6 +51,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 #define DEBUG
 
 QHttpSocketEngine::QHttpSocketEngine(QObject *parent)
@@ -186,8 +188,7 @@ bool QHttpSocketEngine::connectToHostByName(const QString &hostname, quint16 por
 bool QHttpSocketEngine::bind(const QHostAddress &, quint16)
 {
     qWarning("Operation is not supported");
-    setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Unsupported socket operation"));
+    setError(QAbstractSocket::UnsupportedSocketOperationError, "Unsupported socket operation"_L1);
     return false;
 }
 
@@ -195,16 +196,14 @@ bool QHttpSocketEngine::listen(int backlog)
 {
     Q_UNUSED(backlog);
     qWarning("Operation is not supported");
-    setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Unsupported socket operation"));
+    setError(QAbstractSocket::UnsupportedSocketOperationError, "Unsupported socket operation"_L1);
     return false;
 }
 
 int QHttpSocketEngine::accept()
 {
     qWarning("Operation is not supported");
-    setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Unsupported socket operation"));
+    setError(QAbstractSocket::UnsupportedSocketOperationError, "Unsupported socket operation"_L1);
     return -1;
 }
 
@@ -239,8 +238,7 @@ qint64 QHttpSocketEngine::read(char *data, qint64 maxlen)
         // failed, return the socket's error. Otherwise, fall through and
         // return as much as we read so far.
         close();
-        setError(QAbstractSocket::RemoteHostClosedError,
-                 QLatin1String("Remote host closed"));
+        setError(QAbstractSocket::RemoteHostClosedError, "Remote host closed"_L1);
         setState(QAbstractSocket::UnconnectedState);
         return -1;
     }
@@ -259,8 +257,7 @@ bool QHttpSocketEngine::joinMulticastGroup(const QHostAddress &,
                                            const QNetworkInterface &)
 {
     qWarning("Operation is not supported");
-    setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Unsupported socket operation"));
+    setError(QAbstractSocket::UnsupportedSocketOperationError, "Unsupported socket operation"_L1);
     return false;
 }
 
@@ -268,8 +265,7 @@ bool QHttpSocketEngine::leaveMulticastGroup(const QHostAddress &,
                                             const QNetworkInterface &)
 {
     qWarning("Operation is not supported");
-    setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Unsupported socket operation"));
+    setError(QAbstractSocket::UnsupportedSocketOperationError, "Unsupported socket operation"_L1);
     return false;
 }
 
@@ -281,8 +277,7 @@ QNetworkInterface QHttpSocketEngine::multicastInterface() const
 bool QHttpSocketEngine::setMulticastInterface(const QNetworkInterface &)
 {
     qWarning("Operation is not supported");
-    setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Unsupported socket operation"));
+    setError(QAbstractSocket::UnsupportedSocketOperationError, "Unsupported socket operation"_L1);
     return false;
 }
 #endif // QT_NO_NETWORKINTERFACE
@@ -303,16 +298,14 @@ qint64 QHttpSocketEngine::pendingDatagramSize() const
 qint64 QHttpSocketEngine::readDatagram(char *, qint64, QIpPacketHeader *, PacketHeaderOptions)
 {
     qWarning("Operation is not supported");
-    setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Unsupported socket operation"));
+    setError(QAbstractSocket::UnsupportedSocketOperationError, "Unsupported socket operation"_L1);
     return -1;
 }
 
 qint64 QHttpSocketEngine::writeDatagram(const char *, qint64, const QIpPacketHeader &)
 {
     qWarning("Operation is not supported");
-    setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Unsupported socket operation"));
+    setError(QAbstractSocket::UnsupportedSocketOperationError, "Unsupported socket operation"_L1);
     return -1;
 }
 
diff --git a/src/network/socket/qlocalserver.cpp b/src/network/socket/qlocalserver.cpp
index aa13c55965..049e2217bd 100644
--- a/src/network/socket/qlocalserver.cpp
+++ b/src/network/socket/qlocalserver.cpp
@@ -47,6 +47,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 /*!
     \class QLocalServer
     \since 4.4
@@ -348,7 +350,7 @@ bool QLocalServer::listen(const QString &name)
 
     if (name.isEmpty()) {
         d->error = QAbstractSocket::HostNotFoundError;
-        QString function = QLatin1String("QLocalServer::listen");
+        QString function = "QLocalServer::listen"_L1;
         d->errorString = tr("%1: Name error").arg(function);
         return false;
     }
diff --git a/src/network/socket/qlocalserver_tcp.cpp b/src/network/socket/qlocalserver_tcp.cpp
index 1c46d75f52..c8f6ca1596 100644
--- a/src/network/socket/qlocalserver_tcp.cpp
+++ b/src/network/socket/qlocalserver_tcp.cpp
@@ -48,6 +48,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 void QLocalServerPrivate::init()
 {
     Q_Q(QLocalServer);
@@ -61,13 +63,13 @@ bool QLocalServerPrivate::listen(const QString &requestedServerName)
     if (!tcpServer.listen(QHostAddress::LocalHost))
         return false;
 
-    const QLatin1String prefix("QLocalServer/");
+    const auto prefix = "QLocalServer/"_L1;
     if (requestedServerName.startsWith(prefix))
         fullServerName = requestedServerName;
     else
         fullServerName = prefix + requestedServerName;
 
-    QSettings settings(QLatin1String("QtProject"), QLatin1String("Qt"));
+    QSettings settings("QtProject"_L1, "Qt"_L1);
     if (settings.contains(fullServerName)) {
         qWarning("QLocalServer::listen: server name is already in use.");
         tcpServer.close();
@@ -85,8 +87,8 @@ bool QLocalServerPrivate::listen(qintptr socketDescriptor)
 
 void QLocalServerPrivate::closeServer()
 {
-    QSettings settings(QLatin1String("QtProject"), QLatin1String("Qt"));
-    if (fullServerName == QLatin1String("QLocalServer"))
+    QSettings settings("QtProject"_L1, "Qt"_L1);
+    if (fullServerName == "QLocalServer"_L1)
         settings.setValue(fullServerName, QVariant());
     else
         settings.remove(fullServerName);
@@ -117,14 +119,14 @@ void QLocalServerPrivate::_q_onNewConnection()
 
 bool QLocalServerPrivate::removeServer(const QString &name)
 {
-    const QLatin1String prefix("QLocalServer/");
+    const auto prefix = "QLocalServer/"_L1;
     QString serverName;
     if (name.startsWith(prefix))
         serverName = name;
     else
         serverName = prefix + name;
 
-    QSettings settings(QLatin1String("QtProject"), QLatin1String("Qt"));
+    QSettings settings("QtProject"_L1, "Qt"_L1);
     if (settings.contains(serverName))
         settings.remove(serverName);
 
diff --git a/src/network/socket/qlocalserver_unix.cpp b/src/network/socket/qlocalserver_unix.cpp
index 8740867416..5c2a4e34c6 100644
--- a/src/network/socket/qlocalserver_unix.cpp
+++ b/src/network/socket/qlocalserver_unix.cpp
@@ -60,6 +60,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 namespace {
 QLocalServer::SocketOptions optionsForPlatform(QLocalServer::SocketOptions srcOptions)
 {
@@ -121,16 +123,16 @@ bool QLocalServerPrivate::listen(const QString &requestedServerName)
         QFileInfo serverNameFileInfo(fullServerName);
         tempDir.emplace(serverNameFileInfo.absolutePath() + u'/');
         if (!tempDir->isValid()) {
-            setError(QLatin1String("QLocalServer::listen"));
+            setError("QLocalServer::listen"_L1);
             return false;
         }
-        encodedTempPath = QFile::encodeName(tempDir->path() + QLatin1String("/s"));
+        encodedTempPath = QFile::encodeName(tempDir->path() + "/s"_L1);
     }
 
     // create the unix socket
     listenSocket = qt_safe_socket(PF_UNIX, SOCK_STREAM, 0);
     if (-1 == listenSocket) {
-        setError(QLatin1String("QLocalServer::listen"));
+        setError("QLocalServer::listen"_L1);
         closeServer();
         return false;
     }
@@ -145,7 +147,7 @@ bool QLocalServerPrivate::listen(const QString &requestedServerName)
     constexpr unsigned int extraCharacters = PlatformSupportsAbstractNamespace ? 2 : 1;
 
     if (sizeof(addr.sun_path) < static_cast<size_t>(encodedFullServerName.size() + extraCharacters)) {
-        setError(QLatin1String("QLocalServer::listen"));
+        setError("QLocalServer::listen"_L1);
         closeServer();
         return false;
     }
@@ -159,7 +161,7 @@ bool QLocalServerPrivate::listen(const QString &requestedServerName)
         addrSize = offsetof(::sockaddr_un, sun_path) + encodedFullServerName.size() + 1;
     } else if (options & QLocalServer::WorldAccessOption) {
         if (sizeof(addr.sun_path) < static_cast<size_t>(encodedTempPath.size() + 1)) {
-            setError(QLatin1String("QLocalServer::listen"));
+            setError("QLocalServer::listen"_L1);
             closeServer();
             return false;
         }
@@ -172,7 +174,7 @@ bool QLocalServerPrivate::listen(const QString &requestedServerName)
 
     // bind
     if (-1 == QT_SOCKET_BIND(listenSocket, (sockaddr *)&addr, addrSize)) {
-        setError(QLatin1String("QLocalServer::listen"));
+        setError("QLocalServer::listen"_L1);
         // if address is in use already, just close the socket, but do not delete the file
         if (errno == EADDRINUSE)
             QT_CLOSE(listenSocket);
@@ -185,7 +187,7 @@ bool QLocalServerPrivate::listen(const QString &requestedServerName)
 
     // listen for connections
     if (-1 == qt_safe_listen(listenSocket, listenBacklog)) {
-        setError(QLatin1String("QLocalServer::listen"));
+        setError("QLocalServer::listen"_L1);
         closeServer();
         return false;
     }
@@ -203,13 +205,13 @@ bool QLocalServerPrivate::listen(const QString &requestedServerName)
             mode |= S_IRWXO;
 
         if (::chmod(encodedTempPath.constData(), mode) == -1) {
-            setError(QLatin1String("QLocalServer::listen"));
+            setError("QLocalServer::listen"_L1);
             closeServer();
             return false;
         }
 
         if (::rename(encodedTempPath.constData(), encodedFullServerName.constData()) == -1) {
-            setError(QLatin1String("QLocalServer::listen"));
+            setError("QLocalServer::listen"_L1);
             closeServer();
             return false;
         }
@@ -301,7 +303,7 @@ void QLocalServerPrivate::_q_onNewConnection()
     QT_SOCKLEN_T length = sizeof(sockaddr_un);
     int connectedSocket = qt_safe_accept(listenSocket, (sockaddr *)&addr, &length);
     if (-1 == connectedSocket) {
-        setError(QLatin1String("QLocalSocket::activated"));
+        setError("QLocalSocket::activated"_L1);
         closeServer();
     } else {
         socketNotifier->setEnabled(pendingConnections.size()
@@ -330,7 +332,7 @@ void QLocalServerPrivate::waitForNewConnection(int msec, bool *timedOut)
         errno = EBADF;
         Q_FALLTHROUGH();
     case -1:
-        setError(QLatin1String("QLocalServer::waitForNewConnection"));
+        setError("QLocalServer::waitForNewConnection"_L1);
         closeServer();
         break;
     }
diff --git a/src/network/socket/qlocalserver_win.cpp b/src/network/socket/qlocalserver_win.cpp
index c8b356cb29..5e45b31410 100644
--- a/src/network/socket/qlocalserver_win.cpp
+++ b/src/network/socket/qlocalserver_win.cpp
@@ -55,6 +55,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 bool QLocalServerPrivate::addListener()
 {
     // The object must not change its address once the
@@ -77,7 +79,7 @@ bool QLocalServerPrivate::addListener()
     if ((socketOptions.value() & QLocalServer::WorldAccessOption)) {
         pSD.reset(new SECURITY_DESCRIPTOR);
         if (!InitializeSecurityDescriptor(pSD.data(), SECURITY_DESCRIPTOR_REVISION)) {
-            setError(QLatin1String("QLocalServerPrivate::addListener"));
+            setError("QLocalServerPrivate::addListener"_L1);
             return false;
         }
         HANDLE hToken = NULL;
@@ -88,7 +90,7 @@ bool QLocalServerPrivate::addListener()
         tokenUserBuffer.fill(0, dwBufferSize);
         auto pTokenUser = reinterpret_cast<PTOKEN_USER>(tokenUserBuffer.data());
         if (!GetTokenInformation(hToken, TokenUser, pTokenUser, dwBufferSize, &dwBufferSize)) {
-            setError(QLatin1String("QLocalServerPrivate::addListener"));
+            setError("QLocalServerPrivate::addListener"_L1);
             CloseHandle(hToken);
             return false;
         }
@@ -98,7 +100,7 @@ bool QLocalServerPrivate::addListener()
         tokenGroupBuffer.fill(0, dwBufferSize);
         auto pTokenGroup = reinterpret_cast<PTOKEN_PRIMARY_GROUP>(tokenGroupBuffer.data());
         if (!GetTokenInformation(hToken, TokenPrimaryGroup, pTokenGroup, dwBufferSize, &dwBufferSize)) {
-            setError(QLatin1String("QLocalServerPrivate::addListener"));
+            setError("QLocalServerPrivate::addListener"_L1);
             CloseHandle(hToken);
             return false;
         }
@@ -125,7 +127,7 @@ bool QLocalServerPrivate::addListener()
         if (!AllocateAndInitializeSid(&WorldAuth, 1, SECURITY_WORLD_RID,
             0, 0, 0, 0, 0, 0, 0,
             &worldSID)) {
-            setError(QLatin1String("QLocalServerPrivate::addListener"));
+            setError("QLocalServerPrivate::addListener"_L1);
             return false;
         }
 
@@ -142,21 +144,21 @@ bool QLocalServerPrivate::addListener()
 
         if (socketOptions.value() & QLocalServer::UserAccessOption) {
             if (!AddAccessAllowedAce(acl, ACL_REVISION, FILE_ALL_ACCESS, pTokenUser->User.Sid)) {
-                setError(QLatin1String("QLocalServerPrivate::addListener"));
+                setError("QLocalServerPrivate::addListener"_L1);
                 FreeSid(worldSID);
                 return false;
             }
         }
         if (socketOptions.value() & QLocalServer::GroupAccessOption) {
             if (!AddAccessAllowedAce(acl, ACL_REVISION, FILE_ALL_ACCESS, pTokenGroup->PrimaryGroup)) {
-                setError(QLatin1String("QLocalServerPrivate::addListener"));
+                setError("QLocalServerPrivate::addListener"_L1);
                 FreeSid(worldSID);
                 return false;
             }
         }
         if (socketOptions.value() & QLocalServer::OtherAccessOption) {
             if (!AddAccessAllowedAce(acl, ACL_REVISION, FILE_ALL_ACCESS, worldSID)) {
-                setError(QLatin1String("QLocalServerPrivate::addListener"));
+                setError("QLocalServerPrivate::addListener"_L1);
                 FreeSid(worldSID);
                 return false;
             }
@@ -164,7 +166,7 @@ bool QLocalServerPrivate::addListener()
         SetSecurityDescriptorOwner(pSD.data(), pTokenUser->User.Sid, FALSE);
         SetSecurityDescriptorGroup(pSD.data(), pTokenGroup->PrimaryGroup, FALSE);
         if (!SetSecurityDescriptorDacl(pSD.data(), TRUE, acl, FALSE)) {
-            setError(QLatin1String("QLocalServerPrivate::addListener"));
+            setError("QLocalServerPrivate::addListener"_L1);
             FreeSid(worldSID);
             return false;
         }
@@ -185,7 +187,7 @@ bool QLocalServerPrivate::addListener()
                  &sa);
 
     if (listener->handle == INVALID_HANDLE_VALUE) {
-        setError(QLatin1String("QLocalServerPrivate::addListener"));
+        setError("QLocalServerPrivate::addListener"_L1);
         listeners.pop_back();
         return false;
     }
@@ -208,7 +210,7 @@ bool QLocalServerPrivate::addListener()
             break;
         default:
             CloseHandle(listener->handle);
-            setError(QLatin1String("QLocalServerPrivate::addListener"));
+            setError("QLocalServerPrivate::addListener"_L1);
             listeners.pop_back();
             return false;
         }
@@ -240,7 +242,7 @@ bool QLocalServerPrivate::listen(const QString &name)
 {
     Q_Q(QLocalServer);
 
-    const QLatin1String pipePath("\\\\.\\pipe\\");
+    const auto pipePath = "\\\\.\\pipe\\"_L1;
     if (name.startsWith(pipePath))
         fullServerName = name;
     else
@@ -300,7 +302,7 @@ void QLocalServerPrivate::_q_onNewConnection()
             } else {
                 if (GetLastError() != ERROR_IO_INCOMPLETE) {
                     q->close();
-                    setError(QLatin1String("QLocalServerPrivate::_q_onNewConnection"));
+                    setError("QLocalServerPrivate::_q_onNewConnection"_L1);
                     return;
                 }
 
diff --git a/src/network/socket/qlocalsocket_tcp.cpp b/src/network/socket/qlocalsocket_tcp.cpp
index 7b3e7c2820..db9c536bd7 100644
--- a/src/network/socket/qlocalsocket_tcp.cpp
+++ b/src/network/socket/qlocalsocket_tcp.cpp
@@ -47,6 +47,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QLocalSocketPrivate::QLocalSocketPrivate() : QIODevicePrivate(),
         tcpSocket(0),
         ownsTcpSocket(true),
@@ -85,7 +87,7 @@ void QLocalSocketPrivate::setSocket(QLocalUnixSocket* socket)
 void QLocalSocketPrivate::_q_errorOccurred(QAbstractSocket::SocketError socketError)
 {
     Q_Q(QLocalSocket);
-    QString function = QLatin1String("QLocalSocket");
+    QString function = "QLocalSocket"_L1;
     QLocalSocket::LocalSocketError error = (QLocalSocket::LocalSocketError)socketError;
     QString errorString = generateErrorString(error, function);
     q->setErrorString(errorString);
@@ -225,23 +227,21 @@ void QLocalSocket::connectToServer(OpenMode openMode)
     emit stateChanged(d->state);
 
     if (d->serverName.isEmpty()) {
-        d->setErrorAndEmit(ServerNotFoundError,
-                           QLatin1String("QLocalSocket::connectToServer"));
+        d->setErrorAndEmit(ServerNotFoundError, "QLocalSocket::connectToServer"_L1);
         return;
     }
 
-    const QLatin1String prefix("QLocalServer/");
+    const auto prefix = "QLocalServer/"_L1;
     if (d->serverName.startsWith(prefix))
         d->fullServerName = d->serverName;
     else
         d->fullServerName = prefix + d->serverName;
 
-    QSettings settings(QLatin1String("QtProject"), QLatin1String("Qt"));
+    QSettings settings("QtProject"_L1, "Qt"_L1);
     bool ok;
     const quint16 port = settings.value(d->fullServerName).toUInt(&ok);
     if (!ok) {
-        d->setErrorAndEmit(ServerNotFoundError,
-                           QLatin1String("QLocalSocket::connectToServer"));
+        d->setErrorAndEmit(ServerNotFoundError, "QLocalSocket::connectToServer"_L1);
         return;
     }
     QIODevice::open(openMode);
diff --git a/src/network/socket/qlocalsocket_unix.cpp b/src/network/socket/qlocalsocket_unix.cpp
index 5e0a49d0ba..f6acc6a97c 100644
--- a/src/network/socket/qlocalsocket_unix.cpp
+++ b/src/network/socket/qlocalsocket_unix.cpp
@@ -62,6 +62,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 namespace {
 // determine the full server path
 static QString pathNameForConnection(const QString &connectingName,
@@ -115,7 +117,7 @@ void QLocalSocketPrivate::init()
 void QLocalSocketPrivate::_q_errorOccurred(QAbstractSocket::SocketError socketError)
 {
     Q_Q(QLocalSocket);
-    QString function = QLatin1String("QLocalSocket");
+    QString function = "QLocalSocket"_L1;
     QLocalSocket::LocalSocketError error = (QLocalSocket::LocalSocketError)socketError;
     QString errorString = generateErrorString(error, function);
     q->setErrorString(errorString);
@@ -245,7 +247,7 @@ void QLocalSocket::connectToServer(OpenMode openMode)
 {
     Q_D(QLocalSocket);
     if (state() == ConnectedState || state() == ConnectingState) {
-        QString errorString = d->generateErrorString(QLocalSocket::OperationError, QLatin1String("QLocalSocket::connectToserver"));
+        QString errorString = d->generateErrorString(QLocalSocket::OperationError, "QLocalSocket::connectToserver"_L1);
         setErrorString(errorString);
         emit errorOccurred(QLocalSocket::OperationError);
         return;
@@ -257,15 +259,13 @@ void QLocalSocket::connectToServer(OpenMode openMode)
     emit stateChanged(d->state);
 
     if (d->serverName.isEmpty()) {
-        d->setErrorAndEmit(ServerNotFoundError,
-                           QLatin1String("QLocalSocket::connectToServer"));
+        d->setErrorAndEmit(ServerNotFoundError, "QLocalSocket::connectToServer"_L1);
         return;
     }
 
     // create the socket
     if (-1 == (d->connectingSocket = qt_safe_socket(PF_UNIX, SOCK_STREAM, 0, O_NONBLOCK))) {
-        d->setErrorAndEmit(UnsupportedSocketOperationError,
-                           QLatin1String("QLocalSocket::connectToServer"));
+        d->setErrorAndEmit(UnsupportedSocketOperationError, "QLocalSocket::connectToServer"_L1);
         return;
     }
 
@@ -298,7 +298,7 @@ void QLocalSocketPrivate::_q_connectToSocket()
     constexpr unsigned int extraCharacters = PlatformSupportsAbstractNamespace ? 2 : 1;
 
     if (sizeof(addr.sun_path) < static_cast<size_t>(encodedConnectingPathName.size() + extraCharacters)) {
-        QString function = QLatin1String("QLocalSocket::connectToServer");
+        QString function = "QLocalSocket::connectToServer"_L1;
         setErrorAndEmit(QLocalSocket::ServerNotFoundError, function);
         return;
     }
@@ -313,7 +313,7 @@ void QLocalSocketPrivate::_q_connectToSocket()
                  encodedConnectingPathName.size() + 1);
     }
     if (-1 == qt_safe_connect(connectingSocket, (struct sockaddr *)&addr, addrSize)) {
-        QString function = QLatin1String("QLocalSocket::connectToServer");
+        QString function = "QLocalSocket::connectToServer"_L1;
         switch (errno)
         {
         case EINVAL:
@@ -361,7 +361,7 @@ void QLocalSocketPrivate::_q_connectToSocket()
         q->QIODevice::open(connectingOpenMode);
         q->emit connected();
     } else {
-        QString function = QLatin1String("QLocalSocket::connectToServer");
+        QString function = "QLocalSocket::connectToServer"_L1;
         setErrorAndEmit(QLocalSocket::UnknownSocketError, function);
     }
     connectingSocket = -1;
@@ -632,7 +632,7 @@ bool QLocalSocket::waitForConnected(int msec)
 
         if (result == -1)
             d->setErrorAndEmit(QLocalSocket::UnknownSocketError,
-                               QLatin1String("QLocalSocket::waitForConnected"));
+                               "QLocalSocket::waitForConnected"_L1);
         else if (result > 0)
             d->_q_connectToSocket();
     } while (state() == ConnectingState && !timer.hasExpired(msec));
diff --git a/src/network/socket/qlocalsocket_win.cpp b/src/network/socket/qlocalsocket_win.cpp
index f7e72c055b..3c9a4152c8 100644
--- a/src/network/socket/qlocalsocket_win.cpp
+++ b/src/network/socket/qlocalsocket_win.cpp
@@ -43,6 +43,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 namespace {
 struct QSocketPoller
 {
@@ -197,14 +199,14 @@ void QLocalSocket::connectToServer(OpenMode openMode)
     emit stateChanged(d->state);
     if (d->serverName.isEmpty()) {
         d->error = ServerNotFoundError;
-        d->errorString = tr("%1: Invalid name").arg(QLatin1String("QLocalSocket::connectToServer"));
+        d->errorString = tr("%1: Invalid name").arg("QLocalSocket::connectToServer"_L1);
         d->state = UnconnectedState;
         emit errorOccurred(d->error);
         emit stateChanged(d->state);
         return;
     }
 
-    const QLatin1String pipePath("\\\\.\\pipe\\");
+    const auto pipePath = "\\\\.\\pipe\\"_L1;
     if (d->serverName.startsWith(pipePath))
         d->fullServerName = d->serverName;
     else
@@ -237,7 +239,7 @@ void QLocalSocket::connectToServer(OpenMode openMode)
 
     if (localSocket == INVALID_HANDLE_VALUE) {
         const DWORD winError = GetLastError();
-        d->_q_winError(winError, QLatin1String("QLocalSocket::connectToServer"));
+        d->_q_winError(winError, "QLocalSocket::connectToServer"_L1);
         d->fullServerName = QString();
         return;
     }
diff --git a/src/network/socket/qnativesocketengine.cpp b/src/network/socket/qnativesocketengine.cpp
index dfc8d96821..91a7439311 100644
--- a/src/network/socket/qnativesocketengine.cpp
+++ b/src/network/socket/qnativesocketengine.cpp
@@ -135,6 +135,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 //#define QNATIVESOCKETENGINE_DEBUG
 
 #define Q_VOID
@@ -448,13 +450,13 @@ bool QNativeSocketEngine::initialize(QAbstractSocket::SocketType socketType, QAb
     // Create the socket
     if (!d->createNewSocket(socketType, protocol)) {
 #if defined (QNATIVESOCKETENGINE_DEBUG)
-        QString typeStr = QLatin1String("UnknownSocketType");
-        if (socketType == QAbstractSocket::TcpSocket) typeStr = QLatin1String("TcpSocket");
-        else if (socketType == QAbstractSocket::UdpSocket) typeStr = QLatin1String("UdpSocket");
-        else if (socketType == QAbstractSocket::SctpSocket) typeStr = QLatin1String("SctpSocket");
-        QString protocolStr = QLatin1String("UnknownProtocol");
-        if (protocol == QAbstractSocket::IPv4Protocol) protocolStr = QLatin1String("IPv4Protocol");
-        else if (protocol == QAbstractSocket::IPv6Protocol) protocolStr = QLatin1String("IPv6Protocol");
+        QString typeStr = "UnknownSocketType"_L1;
+        if (socketType == QAbstractSocket::TcpSocket) typeStr = "TcpSocket"_L1;
+        else if (socketType == QAbstractSocket::UdpSocket) typeStr = "UdpSocket"_L1;
+        else if (socketType == QAbstractSocket::SctpSocket) typeStr = "SctpSocket"_L1;
+        QString protocolStr = "UnknownProtocol"_L1;
+        if (protocol == QAbstractSocket::IPv4Protocol) protocolStr = "IPv4Protocol"_L1;
+        else if (protocol == QAbstractSocket::IPv6Protocol) protocolStr = "IPv6Protocol"_L1;
         qDebug("QNativeSocketEngine::initialize(type == %s, protocol == %s) failed: %s",
                typeStr.toLatin1().constData(), protocolStr.toLatin1().constData(), d->socketErrorString.toLatin1().constData());
 #endif
diff --git a/src/network/socket/qsocks5socketengine.cpp b/src/network/socket/qsocks5socketengine.cpp
index ff0cc8ecfe..3625041efb 100644
--- a/src/network/socket/qsocks5socketengine.cpp
+++ b/src/network/socket/qsocks5socketengine.cpp
@@ -60,6 +60,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 static const int MaxWriteBufferSize = 128*1024;
 
 //#define QSOCKS5SOCKETLAYER_DEBUG
@@ -102,22 +104,22 @@ static const int MaxWriteBufferSize = 128*1024;
 static QString s5StateToString(QSocks5SocketEnginePrivate::Socks5State s)
 {
     switch (s) {
-    case QSocks5SocketEnginePrivate::Uninitialized: return QLatin1String("Uninitialized");
-    case QSocks5SocketEnginePrivate::ConnectError: return QLatin1String("ConnectError");
-    case QSocks5SocketEnginePrivate::AuthenticationMethodsSent: return QLatin1String("AuthenticationMethodsSent");
-    case QSocks5SocketEnginePrivate::Authenticating: return QLatin1String("Authenticating");
-    case QSocks5SocketEnginePrivate::AuthenticatingError: return QLatin1String("AuthenticatingError");
-    case QSocks5SocketEnginePrivate::RequestMethodSent: return QLatin1String("RequestMethodSent");
-    case QSocks5SocketEnginePrivate::RequestError: return QLatin1String("RequestError");
-    case QSocks5SocketEnginePrivate::Connected: return QLatin1String("Connected");
-    case QSocks5SocketEnginePrivate::UdpAssociateSuccess: return QLatin1String("UdpAssociateSuccess");
-    case QSocks5SocketEnginePrivate::BindSuccess: return QLatin1String("BindSuccess");
-    case QSocks5SocketEnginePrivate::ControlSocketError: return QLatin1String("ControlSocketError");
-    case QSocks5SocketEnginePrivate::SocksError: return QLatin1String("SocksError");
-    case QSocks5SocketEnginePrivate::HostNameLookupError: return QLatin1String("HostNameLookupError");
+    case QSocks5SocketEnginePrivate::Uninitialized: return "Uninitialized"_L1;
+    case QSocks5SocketEnginePrivate::ConnectError: return "ConnectError"_L1;
+    case QSocks5SocketEnginePrivate::AuthenticationMethodsSent: return "AuthenticationMethodsSent"_L1;
+    case QSocks5SocketEnginePrivate::Authenticating: return "Authenticating"_L1;
+    case QSocks5SocketEnginePrivate::AuthenticatingError: return "AuthenticatingError"_L1;
+    case QSocks5SocketEnginePrivate::RequestMethodSent: return "RequestMethodSent"_L1;
+    case QSocks5SocketEnginePrivate::RequestError: return "RequestError"_L1;
+    case QSocks5SocketEnginePrivate::Connected: return "Connected"_L1;
+    case QSocks5SocketEnginePrivate::UdpAssociateSuccess: return "UdpAssociateSuccess"_L1;
+    case QSocks5SocketEnginePrivate::BindSuccess: return "BindSuccess"_L1;
+    case QSocks5SocketEnginePrivate::ControlSocketError: return "ControlSocketError"_L1;
+    case QSocks5SocketEnginePrivate::SocksError: return "SocksError"_L1;
+    case QSocks5SocketEnginePrivate::HostNameLookupError: return "HostNameLookupError"_L1;
     default: break;
     }
-    return QLatin1String("unknown state");
+    return "unknown state"_L1;
 }
 
 static QString dump(const QByteArray &buf)
@@ -130,7 +132,7 @@ static QString dump(const QByteArray &buf)
         data += QString::number(val);
     }
     if (buf.size() > MAX_DATA_DUMP)
-        data += QLatin1String(" ...");
+        data += " ..."_L1;
 
     return QString::fromLatin1("size: %1 data: { %2 }").arg(buf.size()).arg(data);
 }
@@ -494,7 +496,7 @@ bool QSocks5PasswordAuthenticator::continueAuthenticate(QTcpSocket *socket, bool
 
 QString QSocks5PasswordAuthenticator::errorString()
 {
-    return QLatin1String("Socks5 user name or password incorrect");
+    return "Socks5 user name or password incorrect"_L1;
 }
 
 
@@ -749,7 +751,7 @@ void QSocks5SocketEnginePrivate::parseAuthenticationMethodReply()
         return;
     } else if (buf.at(1) != data->authenticator->methodId()
                || !data->authenticator->beginAuthenticate(data->controlSocket, &authComplete)) {
-        setErrorState(AuthenticatingError, QLatin1String("Socks5 host did not support authentication method."));
+        setErrorState(AuthenticatingError, "Socks5 host did not support authentication method."_L1);
         socketError = QAbstractSocket::SocketAccessError; // change the socket error
         emitConnectionNotification();
         return;
@@ -1102,7 +1104,7 @@ bool QSocks5SocketEngine::connectInternal()
         } else if (socketType() == QAbstractSocket::UdpSocket) {
             d->initialize(QSocks5SocketEnginePrivate::UdpAssociateMode);
             // all udp needs to be bound
-            if (!bind(QHostAddress(QLatin1String("0.0.0.0")), 0))
+            if (!bind(QHostAddress("0.0.0.0"_L1), 0))
                 return false;
 
             setState(QAbstractSocket::ConnectedState);
@@ -1439,10 +1441,10 @@ int QSocks5SocketEngine::accept()
         d->socketState = QAbstractSocket::UnconnectedState;
         break;
     case QSocks5SocketEnginePrivate::ControlSocketError:
-        setError(QAbstractSocket::ProxyProtocolError, QLatin1String("Control socket error"));
+        setError(QAbstractSocket::ProxyProtocolError, "Control socket error"_L1);
         break;
     default:
-        setError(QAbstractSocket::ProxyProtocolError, QLatin1String("SOCKS5 proxy error"));
+        setError(QAbstractSocket::ProxyProtocolError, "SOCKS5 proxy error"_L1);
         break;
     }
     return sd;
@@ -1494,7 +1496,7 @@ qint64 QSocks5SocketEngine::read(char *data, qint64 maxlen)
                 //imitate remote closed
                 close();
                 setError(QAbstractSocket::RemoteHostClosedError,
-                         QLatin1String("Remote host closed connection###"));
+                         "Remote host closed connection###"_L1);
                 setState(QAbstractSocket::UnconnectedState);
                 return -1;
             } else {
@@ -1557,7 +1559,7 @@ bool QSocks5SocketEngine::joinMulticastGroup(const QHostAddress &,
                                              const QNetworkInterface &)
 {
     setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Operation on socket is not supported"));
+             "Operation on socket is not supported"_L1);
     return false;
 }
 
@@ -1565,7 +1567,7 @@ bool QSocks5SocketEngine::leaveMulticastGroup(const QHostAddress &,
                                               const QNetworkInterface &)
 {
     setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Operation on socket is not supported"));
+             "Operation on socket is not supported"_L1);
     return false;
 }
 
@@ -1578,7 +1580,7 @@ QNetworkInterface QSocks5SocketEngine::multicastInterface() const
 bool QSocks5SocketEngine::setMulticastInterface(const QNetworkInterface &)
 {
     setError(QAbstractSocket::UnsupportedSocketOperationError,
-             QLatin1String("Operation on socket is not supported"));
+             "Operation on socket is not supported"_L1);
     return false;
 }
 #endif // QT_NO_NETWORKINTERFACE
@@ -1634,7 +1636,7 @@ qint64 QSocks5SocketEngine::writeDatagram(const char *data, qint64 len, const QI
     if (!d->data) {
         d->initialize(QSocks5SocketEnginePrivate::UdpAssociateMode);
         // all udp needs to be bound
-        if (!bind(QHostAddress(QLatin1String("0.0.0.0")), 0)) {
+        if (!bind(QHostAddress("0.0.0.0"_L1), 0)) {
             //### set error
             return -1;
         }
diff --git a/src/network/ssl/qsslcertificate.cpp b/src/network/ssl/qsslcertificate.cpp
index 2c1c06e3a6..11e05841f8 100644
--- a/src/network/ssl/qsslcertificate.cpp
+++ b/src/network/ssl/qsslcertificate.cpp
@@ -151,6 +151,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 QT_IMPL_METATYPE_EXTERN(QSslCertificate)
 
 QSslCertificatePrivate::QSslCertificatePrivate()
@@ -665,9 +667,9 @@ QList<QSslCertificate> QSslCertificate::fromPath(const QString &path,
 
 #if QT_CONFIG(regularexpression)
     if (syntax == PatternSyntax::Wildcard)
-        pos = pathPrefix.indexOf(QRegularExpression(QLatin1String("[*?[]")));
+        pos = pathPrefix.indexOf(QRegularExpression("[*?[]"_L1));
     else if (syntax == PatternSyntax::RegularExpression)
-        pos = sourcePath.indexOf(QRegularExpression(QLatin1String("[\\$\\(\\)\\*\\+\\.\\?\\[\\]\\^\\{\\}\\|]")));
+        pos = sourcePath.indexOf(QRegularExpression("[\\$\\(\\)\\*\\+\\.\\?\\[\\]\\^\\{\\}\\|]"_L1));
 #else
     if (syntax == PatternSyntax::Wildcard || syntax == PatternSyntax::RegExp)
         qWarning("Regular expression support is disabled in this build. Only fixed string can be searched");
@@ -698,7 +700,7 @@ QList<QSslCertificate> QSslCertificate::fromPath(const QString &path,
     // Special case - if the prefix ends up being nothing, use "." instead.
     int startIndex = 0;
     if (pathPrefix.isEmpty()) {
-        pathPrefix = QLatin1String(".");
+        pathPrefix = "."_L1;
         startIndex = 2;
     }
 
diff --git a/src/network/ssl/qsslsocket.cpp b/src/network/ssl/qsslsocket.cpp
index 63d710c652..9401f4a773 100644
--- a/src/network/ssl/qsslsocket.cpp
+++ b/src/network/ssl/qsslsocket.cpp
@@ -399,6 +399,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 class QSslSocketGlobalData
 {
 public:
@@ -2085,12 +2087,12 @@ void QSslSocketPrivate::init()
 */
 bool QSslSocketPrivate::verifyProtocolSupported(const char *where)
 {
-    QLatin1String protocolName("DTLS");
+    auto protocolName = "DTLS"_L1;
     switch (configuration.protocol) {
     case QSsl::UnknownProtocol:
         // UnknownProtocol, according to our docs, is for cipher whose protocol is unknown.
         // Should not be used when configuring QSslSocket.
-        protocolName = QLatin1String("UnknownProtocol");
+        protocolName = "UnknownProtocol"_L1;
         Q_FALLTHROUGH();
 QT_WARNING_PUSH
 QT_WARNING_DISABLE_DEPRECATED
@@ -3078,7 +3080,7 @@ bool QSslSocketPrivate::isMatchingHostname(const QString &cn, const QString &hos
 
     // Reject wildcard character embedded within the A-labels or U-labels of an internationalized
     // domain name (RFC6125 section 7.2)
-    if (cn.startsWith(QLatin1String("xn--"), Qt::CaseInsensitive))
+    if (cn.startsWith("xn--"_L1, Qt::CaseInsensitive))
         return false;
 
     // Check characters preceding * (if any) match
diff --git a/src/network/ssl/qtlsbackend.cpp b/src/network/ssl/qtlsbackend.cpp
index 7fbd27c282..feb60d0e47 100644
--- a/src/network/ssl/qtlsbackend.cpp
+++ b/src/network/ssl/qtlsbackend.cpp
@@ -61,6 +61,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 Q_APPLICATION_STATIC(QFactoryLoader, loader, QTlsBackend_iid,
                      QStringLiteral("/tls"))
 
@@ -832,13 +834,13 @@ QT_WARNING_DISABLE_DEPRECATED
         }
 QT_WARNING_POP
 
-        if (descriptionList.at(2).startsWith(QLatin1String("Kx=")))
+        if (descriptionList.at(2).startsWith("Kx="_L1))
             ciph.d->keyExchangeMethod = descriptionList.at(2).mid(3).toString();
-        if (descriptionList.at(3).startsWith(QLatin1String("Au=")))
+        if (descriptionList.at(3).startsWith("Au="_L1))
             ciph.d->authenticationMethod = descriptionList.at(3).mid(3).toString();
-        if (descriptionList.at(4).startsWith(QLatin1String("Enc=")))
+        if (descriptionList.at(4).startsWith("Enc="_L1))
             ciph.d->encryptionMethod = descriptionList.at(4).mid(4).toString();
-        ciph.d->exportable = (descriptionList.size() > 6 && descriptionList.at(6) == QLatin1String("export"));
+        ciph.d->exportable = (descriptionList.size() > 6 && descriptionList.at(6) == "export"_L1);
 
         ciph.d->bits = bits;
         ciph.d->supportedBits = supportedBits;
@@ -852,7 +854,7 @@ QT_WARNING_POP
     Auxiliary function. Creates a new QSslCipher from \a suiteName, \a protocol version and
     \a protocolString. For example:
     \code
-    createCiphersuite(QLatin1String("ECDHE-RSA-AES256-GCM-SHA256"), QSsl::TlsV1_2, QLatin1String("TLSv1.2"));
+    createCiphersuite("ECDHE-RSA-AES256-GCM-SHA256"_L1, QSsl::TlsV1_2, "TLSv1.2"_L1);
     \endcode
 */
 QSslCipher QTlsBackend::createCiphersuite(const QString &suiteName, QSsl::SslProtocol protocol,
@@ -871,49 +873,49 @@ QSslCipher QTlsBackend::createCiphersuite(const QString &suiteName, QSsl::SslPro
     const auto bits = QStringView{ciph.d->name}.split(u'-');
     if (bits.size() >= 2) {
         if (bits.size() == 2 || bits.size() == 3)
-            ciph.d->keyExchangeMethod = QLatin1String("RSA");
-        else if (bits.front() == QLatin1String("DH") || bits.front() == QLatin1String("DHE"))
-            ciph.d->keyExchangeMethod = QLatin1String("DH");
-        else if (bits.front() == QLatin1String("ECDH") || bits.front() == QLatin1String("ECDHE"))
-            ciph.d->keyExchangeMethod = QLatin1String("ECDH");
+            ciph.d->keyExchangeMethod = "RSA"_L1;
+        else if (bits.front() == "DH"_L1 || bits.front() == "DHE"_L1)
+            ciph.d->keyExchangeMethod = "DH"_L1;
+        else if (bits.front() == "ECDH"_L1 || bits.front() == "ECDHE"_L1)
+            ciph.d->keyExchangeMethod = "ECDH"_L1;
         else
             qCWarning(lcSsl) << "Unknown Kx" << ciph.d->name;
 
         if (bits.size() == 2 || bits.size() == 3)
-            ciph.d->authenticationMethod = QLatin1String("RSA");
-        else if (ciph.d->name.contains(QLatin1String("-ECDSA-")))
-            ciph.d->authenticationMethod = QLatin1String("ECDSA");
-        else if (ciph.d->name.contains(QLatin1String("-RSA-")))
-            ciph.d->authenticationMethod = QLatin1String("RSA");
+            ciph.d->authenticationMethod = "RSA"_L1;
+        else if (ciph.d->name.contains("-ECDSA-"_L1))
+            ciph.d->authenticationMethod = "ECDSA"_L1;
+        else if (ciph.d->name.contains("-RSA-"_L1))
+            ciph.d->authenticationMethod = "RSA"_L1;
         else
             qCWarning(lcSsl) << "Unknown Au" << ciph.d->name;
 
-        if (ciph.d->name.contains(QLatin1String("RC4-"))) {
-            ciph.d->encryptionMethod = QLatin1String("RC4(128)");
+        if (ciph.d->name.contains("RC4-"_L1)) {
+            ciph.d->encryptionMethod = "RC4(128)"_L1;
             ciph.d->bits = 128;
             ciph.d->supportedBits = 128;
-        } else if (ciph.d->name.contains(QLatin1String("DES-CBC3-"))) {
-            ciph.d->encryptionMethod = QLatin1String("3DES(168)");
+        } else if (ciph.d->name.contains("DES-CBC3-"_L1)) {
+            ciph.d->encryptionMethod = "3DES(168)"_L1;
             ciph.d->bits = 168;
             ciph.d->supportedBits = 168;
-        } else if (ciph.d->name.contains(QLatin1String("AES128-"))) {
-            ciph.d->encryptionMethod = QLatin1String("AES(128)");
+        } else if (ciph.d->name.contains("AES128-"_L1)) {
+            ciph.d->encryptionMethod = "AES(128)"_L1;
             ciph.d->bits = 128;
             ciph.d->supportedBits = 128;
-        } else if (ciph.d->name.contains(QLatin1String("AES256-GCM"))) {
-            ciph.d->encryptionMethod = QLatin1String("AESGCM(256)");
+        } else if (ciph.d->name.contains("AES256-GCM"_L1)) {
+            ciph.d->encryptionMethod = "AESGCM(256)"_L1;
             ciph.d->bits = 256;
             ciph.d->supportedBits = 256;
-        } else if (ciph.d->name.contains(QLatin1String("AES256-"))) {
-            ciph.d->encryptionMethod = QLatin1String("AES(256)");
+        } else if (ciph.d->name.contains("AES256-"_L1)) {
+            ciph.d->encryptionMethod = "AES(256)"_L1;
             ciph.d->bits = 256;
             ciph.d->supportedBits = 256;
-        } else if (ciph.d->name.contains(QLatin1String("CHACHA20-"))) {
-            ciph.d->encryptionMethod = QLatin1String("CHACHA20");
+        } else if (ciph.d->name.contains("CHACHA20-"_L1)) {
+            ciph.d->encryptionMethod = "CHACHA20"_L1;
             ciph.d->bits = 256;
             ciph.d->supportedBits = 256;
-        } else if (ciph.d->name.contains(QLatin1String("NULL-"))) {
-            ciph.d->encryptionMethod = QLatin1String("NULL");
+        } else if (ciph.d->name.contains("NULL-"_L1)) {
+            ciph.d->encryptionMethod = "NULL"_L1;
         } else {
             qCWarning(lcSsl) << "Unknown Enc" << ciph.d->name;
         }
@@ -926,7 +928,7 @@ QSslCipher QTlsBackend::createCiphersuite(const QString &suiteName, QSsl::SslPro
     Auxiliary function. Creates a new QSslCipher from \a name (which is an implementation-specific
     string), \a protocol and \a protocolString, e.g.:
     \code
-    createCipher(QStringLiteral("schannel"), QSsl::TlsV1_2, QLatin1String("TLSv1.2"));
+    createCipher(QStringLiteral("schannel"), QSsl::TlsV1_2, "TLSv1.2"_L1);
     \endcode
 */
 QSslCipher QTlsBackend::createCipher(const QString &name, QSsl::SslProtocol protocol,
diff --git a/src/plugins/networkinformation/glib/qglibnetworkinformationbackend.cpp b/src/plugins/networkinformation/glib/qglibnetworkinformationbackend.cpp
index f26079b041..dbfc04e6b1 100644
--- a/src/plugins/networkinformation/glib/qglibnetworkinformationbackend.cpp
+++ b/src/plugins/networkinformation/glib/qglibnetworkinformationbackend.cpp
@@ -45,6 +45,9 @@
 #include <gio/gio.h>
 
 QT_BEGIN_NAMESPACE
+
+using namespace Qt::StringLiterals;
+
 Q_DECLARE_LOGGING_CATEGORY(lcNetInfoGlib)
 Q_LOGGING_CATEGORY(lcNetInfoGlib, "qt.network.info.glib");
 
@@ -141,7 +144,7 @@ QGlibNetworkInformationBackend::~QGlibNetworkInformationBackend()
 
 bool QGlibNetworkInformationBackend::isValid() const
 {
-    return G_OBJECT_TYPE_NAME(networkMonitor) != QLatin1String("GNetworkMonitorBase");
+    return G_OBJECT_TYPE_NAME(networkMonitor) != "GNetworkMonitorBase"_L1;
 }
 
 void QGlibNetworkInformationBackend::updateInformation(QGlibNetworkInformationBackend *backend)
diff --git a/src/plugins/networkinformation/networkmanager/qnetworkmanagerservice.cpp b/src/plugins/networkinformation/networkmanager/qnetworkmanagerservice.cpp
index f8fd100a7e..74d89d8f5d 100644
--- a/src/plugins/networkinformation/networkmanager/qnetworkmanagerservice.cpp
+++ b/src/plugins/networkinformation/networkmanager/qnetworkmanagerservice.cpp
@@ -64,7 +64,7 @@ QT_BEGIN_NAMESPACE
 using namespace Qt::StringLiterals;
 
 QNetworkManagerInterfaceBase::QNetworkManagerInterfaceBase(QObject *parent)
-    : QDBusAbstractInterface(QLatin1String(NM_DBUS_SERVICE), QLatin1String(NM_DBUS_PATH),
+    : QDBusAbstractInterface(NM_DBUS_SERVICE ""_L1, NM_DBUS_PATH ""_L1,
                              NM_DBUS_INTERFACE, QDBusConnection::systemBus(), parent)
 {
 }
@@ -81,29 +81,27 @@ QNetworkManagerInterface::QNetworkManagerInterface(QObject *parent)
         return;
 
     PropertiesDBusInterface managerPropertiesInterface(
-            QLatin1String(NM_DBUS_SERVICE), QLatin1String(NM_DBUS_PATH), DBUS_PROPERTIES_INTERFACE,
+            NM_DBUS_SERVICE ""_L1, NM_DBUS_PATH ""_L1, DBUS_PROPERTIES_INTERFACE,
             QDBusConnection::systemBus());
     QList<QVariant> argumentList;
-    argumentList << QLatin1String(NM_DBUS_INTERFACE);
+    argumentList << NM_DBUS_INTERFACE ""_L1;
     QDBusPendingReply<QVariantMap> propsReply = managerPropertiesInterface.callWithArgumentList(
-            QDBus::Block, QLatin1String("GetAll"), argumentList);
+            QDBus::Block, "GetAll"_L1, argumentList);
     if (!propsReply.isError()) {
         propertyMap = propsReply.value();
     } else {
         qWarning() << "propsReply" << propsReply.error().message();
     }
 
-    QDBusConnection::systemBus().connect(
-            QLatin1String(NM_DBUS_SERVICE), QLatin1String(NM_DBUS_PATH),
-            QLatin1String(DBUS_PROPERTIES_INTERFACE), QLatin1String("PropertiesChanged"), this,
+    QDBusConnection::systemBus().connect(NM_DBUS_SERVICE ""_L1, NM_DBUS_PATH ""_L1,
+            DBUS_PROPERTIES_INTERFACE""_L1, "PropertiesChanged"_L1, this,
             SLOT(setProperties(QString, QMap<QString, QVariant>, QList<QString>)));
 }
 
 QNetworkManagerInterface::~QNetworkManagerInterface()
 {
-    QDBusConnection::systemBus().disconnect(
-            QLatin1String(NM_DBUS_SERVICE), QLatin1String(NM_DBUS_PATH),
-            QLatin1String(DBUS_PROPERTIES_INTERFACE), QLatin1String("PropertiesChanged"), this,
+    QDBusConnection::systemBus().disconnect(NM_DBUS_SERVICE ""_L1, NM_DBUS_PATH ""_L1,
+            DBUS_PROPERTIES_INTERFACE ""_L1, "PropertiesChanged"_L1, this,
             SLOT(setProperties(QString, QMap<QString, QVariant>, QList<QString>)));
 }
 
@@ -202,17 +200,17 @@ void QNetworkManagerInterface::setProperties(const QString &interfaceName,
         }
 
         if (valueChanged) {
-            if (i.key() == QLatin1String("State")) {
+            if (i.key() == "State"_L1) {
                 quint32 state = i.value().toUInt();
                 Q_EMIT stateChanged(static_cast<NMState>(state));
-            } else if (i.key() == QLatin1String("Connectivity")) {
+            } else if (i.key() == "Connectivity"_L1) {
                 quint32 state = i.value().toUInt();
                 Q_EMIT connectivityChanged(static_cast<NMConnectivityState>(state));
-            } else if (i.key() == QLatin1String("PrimaryConnection")) {
+            } else if (i.key() == "PrimaryConnection"_L1) {
                 const QDBusObjectPath devicePath = i->value<QDBusObjectPath>();
                 Q_EMIT deviceTypeChanged(extractDeviceType(devicePath));
                 Q_EMIT meteredChanged(extractDeviceMetered(devicePath));
-            } else if (i.key() == QLatin1String("Metered")) {
+            } else if (i.key() == "Metered"_L1) {
                 Q_EMIT meteredChanged(static_cast<NMMetered>(i->toUInt()));
             }
         }
diff --git a/src/plugins/tls/openssl/qsslsocket_openssl_symbols.cpp b/src/plugins/tls/openssl/qsslsocket_openssl_symbols.cpp
index a483c92bd2..30797e5a29 100644
--- a/src/plugins/tls/openssl/qsslsocket_openssl_symbols.cpp
+++ b/src/plugins/tls/openssl/qsslsocket_openssl_symbols.cpp
@@ -81,6 +81,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 /*
     Note to maintainer:
     -------------------
@@ -628,12 +630,12 @@ static QStringList libraryPathList()
 #  else
     paths = QString::fromLatin1(qgetenv("LD_LIBRARY_PATH")).split(u':', Qt::SkipEmptyParts);
 #  endif
-    paths << QLatin1String("/lib") << QLatin1String("/usr/lib") << QLatin1String("/usr/local/lib");
-    paths << QLatin1String("/lib64") << QLatin1String("/usr/lib64") << QLatin1String("/usr/local/lib64");
-    paths << QLatin1String("/lib32") << QLatin1String("/usr/lib32") << QLatin1String("/usr/local/lib32");
+    paths << "/lib"_L1 << "/usr/lib"_L1 << "/usr/local/lib"_L1;
+    paths << "/lib64"_L1 << "/usr/lib64"_L1 << "/usr/local/lib64"_L1;
+    paths << "/lib32"_L1 << "/usr/lib32"_L1 << "/usr/local/lib32"_L1;
 
 #if defined(Q_OS_ANDROID)
-    paths << QLatin1String("/system/lib");
+    paths << "/system/lib"_L1;
 #elif defined(Q_OS_LINUX)
     // discover paths of already loaded libraries
     QDuplicateTracker<QString> loadedPaths;
@@ -665,12 +667,12 @@ static QStringList findAllLibs(QLatin1String filter)
 
 static QStringList findAllLibSsl()
 {
-    return findAllLibs(QLatin1String("libssl.*"));
+    return findAllLibs("libssl.*"_L1);
 }
 
 static QStringList findAllLibCrypto()
 {
-    return findAllLibs(QLatin1String("libcrypto.*"));
+    return findAllLibs("libcrypto.*"_L1);
 }
 # endif
 
@@ -721,8 +723,8 @@ static LoadedOpenSsl loadOpenSsl()
 #define QT_SSL_SUFFIX
 #endif
 
-    tryToLoadOpenSslWin32Library(QLatin1String("libssl-" QT_OPENSSL_VERSION QT_SSL_SUFFIX),
-                                 QLatin1String("libcrypto-" QT_OPENSSL_VERSION QT_SSL_SUFFIX), result);
+    tryToLoadOpenSslWin32Library("libssl-" QT_OPENSSL_VERSION QT_SSL_SUFFIX ""_L1,
+                                 "libcrypto-" QT_OPENSSL_VERSION QT_SSL_SUFFIX ""_L1, result);
 
 #undef QT_SSL_SUFFIX
     return result;
@@ -779,8 +781,8 @@ static LoadedOpenSsl loadOpenSsl()
 #endif
 #if defined(SHLIB_VERSION_NUMBER) && !defined(Q_OS_QNX) // on QNX, the libs are always libssl.so and libcrypto.so
     // first attempt: the canonical name is libssl.so.<SHLIB_VERSION_NUMBER>
-    libssl->setFileNameAndVersion(QLatin1String("ssl"), QLatin1String(SHLIB_VERSION_NUMBER));
-    libcrypto->setFileNameAndVersion(QLatin1String("crypto"), QLatin1String(SHLIB_VERSION_NUMBER));
+    libssl->setFileNameAndVersion("ssl"_L1, SHLIB_VERSION_NUMBER ""_L1);
+    libcrypto->setFileNameAndVersion("crypto"_L1, SHLIB_VERSION_NUMBER ""_L1);
     if (libcrypto->load() && libssl->load()) {
         // libssl.so.<SHLIB_VERSION_NUMBER> and libcrypto.so.<SHLIB_VERSION_NUMBER> found
         return result;
@@ -808,11 +810,11 @@ static LoadedOpenSsl loadOpenSsl()
 
     static QString suffix = QString::fromLatin1(openSSLSuffix("_1_1"));
 
-    libssl->setFileNameAndVersion(QLatin1String("ssl") + suffix, -1);
-    libcrypto->setFileNameAndVersion(QLatin1String("crypto") + suffix, -1);
+    libssl->setFileNameAndVersion("ssl"_L1 + suffix, -1);
+    libcrypto->setFileNameAndVersion("crypto"_L1 + suffix, -1);
 # else
-    libssl->setFileNameAndVersion(QLatin1String("ssl"), -1);
-    libcrypto->setFileNameAndVersion(QLatin1String("crypto"), -1);
+    libssl->setFileNameAndVersion("ssl"_L1, -1);
+    libcrypto->setFileNameAndVersion("crypto"_L1, -1);
 # endif
     if (libcrypto->load() && libssl->load()) {
         // libssl.so.0 and libcrypto.so.0 found
diff --git a/src/plugins/tls/openssl/qtls_openssl.cpp b/src/plugins/tls/openssl/qtls_openssl.cpp
index 189730a594..f022ebcd6d 100644
--- a/src/plugins/tls/openssl/qtls_openssl.cpp
+++ b/src/plugins/tls/openssl/qtls_openssl.cpp
@@ -60,6 +60,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 namespace  {
 
 QSsl::AlertLevel tlsAlertLevel(int value)
@@ -85,7 +87,7 @@ QString tlsAlertDescription(int value)
 {
     QString description = QLatin1String(q_SSL_alert_desc_string_long(value));
     if (!description.size())
-        description = QLatin1String("no description provided");
+        description = "no description provided"_L1;
     return description;
 }
 
@@ -822,7 +824,7 @@ void TlsCryptographOpenSSL::continueHandshake()
         debugLineClientRandom.append(masterKey.toHex().toUpper());
         debugLineClientRandom.append("\n");
 
-        QString sslKeyFile = QDir::tempPath() + QLatin1String("/qt-ssl-keys");
+        QString sslKeyFile = QDir::tempPath() + "/qt-ssl-keys"_L1;
         QFile file(sslKeyFile);
         if (!file.open(QIODevice::Append))
             qCWarning(lcTlsBackend) << "could not open file" << sslKeyFile << "for appending";
diff --git a/src/plugins/tls/openssl/qtlsbackend_openssl.cpp b/src/plugins/tls/openssl/qtlsbackend_openssl.cpp
index 6a25163162..6693cc8142 100644
--- a/src/plugins/tls/openssl/qtlsbackend_openssl.cpp
+++ b/src/plugins/tls/openssl/qtlsbackend_openssl.cpp
@@ -65,6 +65,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 Q_LOGGING_CATEGORY(lcTlsBackend, "qt.tlsbackend.ossl");
 
 Q_GLOBAL_STATIC(QRecursiveMutex, qt_opensslInitMutex)
@@ -80,9 +82,9 @@ static void q_loadCiphersForConnection(SSL *connection, QList<QSslCipher> &ciphe
             const auto ciph = QTlsBackendOpenSSL::qt_OpenSSL_cipher_to_QSslCipher(cipher);
             if (!ciph.isNull()) {
                 // Unconditionally exclude ADH and AECDH ciphers since they offer no MITM protection
-                if (!ciph.name().toLower().startsWith(QLatin1String("adh")) &&
-                    !ciph.name().toLower().startsWith(QLatin1String("exp-adh")) &&
-                    !ciph.name().toLower().startsWith(QLatin1String("aecdh"))) {
+                if (!ciph.name().toLower().startsWith("adh"_L1) &&
+                    !ciph.name().toLower().startsWith("exp-adh"_L1) &&
+                    !ciph.name().toLower().startsWith("aecdh"_L1)) {
                     ciphers << ciph;
 
                     if (ciph.usedBits() >= 128)
@@ -104,7 +106,7 @@ QString QTlsBackendOpenSSL::getErrorsFromOpenSsl()
     unsigned long errNum;
     while ((errNum = q_ERR_get_error())) {
         if (!errorString.isEmpty())
-            errorString.append(QLatin1String(", "));
+            errorString.append(", "_L1);
         q_ERR_error_string_n(errNum, buf, sizeof buf);
         errorString.append(QString::fromLatin1(buf)); // error is ascii according to man ERR_error_string
     }
@@ -226,7 +228,7 @@ void QTlsBackendOpenSSL::ensureCiphersAndCertsLoaded() const
     // check whether we can enable on-demand root-cert loading (i.e. check whether the sym links are there)
     const QList<QByteArray> dirs = QSslSocketPrivate::unixRootCertDirectories();
     QStringList symLinkFilter;
-    symLinkFilter << QLatin1String("[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f].[0-9]");
+    symLinkFilter << "[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f].[0-9]"_L1;
     for (const auto &dir : dirs) {
         QDirIterator iterator(QLatin1String(dir), symLinkFilter, QDir::Files);
         if (iterator.hasNext()) {
diff --git a/src/plugins/tls/openssl/qx509_openssl.cpp b/src/plugins/tls/openssl/qx509_openssl.cpp
index b7c2e7cff4..b614014a0f 100644
--- a/src/plugins/tls/openssl/qx509_openssl.cpp
+++ b/src/plugins/tls/openssl/qx509_openssl.cpp
@@ -57,6 +57,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 namespace QTlsPrivate {
 
 namespace {
@@ -305,9 +307,9 @@ QVariant x509ExtensionToValue(X509_EXTENSION *ext)
             if (!basic)
                 return {};
             QVariantMap result;
-            result[QLatin1String("ca")] = basic->ca ? true : false;
+            result["ca"_L1] = basic->ca ? true : false;
             if (basic->pathlen)
-                result[QLatin1String("pathLenConstraint")] = (qlonglong)q_ASN1_INTEGER_get(basic->pathlen);
+                result["pathLenConstraint"_L1] = (qlonglong)q_ASN1_INTEGER_get(basic->pathlen);
 
             q_BASIC_CONSTRAINTS_free(basic);
             return result;
@@ -364,7 +366,7 @@ QVariant x509ExtensionToValue(X509_EXTENSION *ext)
             if (auth_key->keyid) {
                 QByteArray keyid(reinterpret_cast<const char *>(auth_key->keyid->data),
                                  auth_key->keyid->length);
-                result[QLatin1String("keyid")] = keyid.toHex();
+                result["keyid"_L1] = keyid.toHex();
             }
 
             // issuer
@@ -372,7 +374,7 @@ QVariant x509ExtensionToValue(X509_EXTENSION *ext)
 
             // serial
             if (auth_key->serial)
-                result[QLatin1String("serial")] = (qlonglong)q_ASN1_INTEGER_get(auth_key->serial);
+                result["serial"_L1] = (qlonglong)q_ASN1_INTEGER_get(auth_key->serial);
 
             q_AUTHORITY_KEYID_free(auth_key);
             return result;
diff --git a/src/plugins/tls/schannel/qtls_schannel.cpp b/src/plugins/tls/schannel/qtls_schannel.cpp
index eb102c2553..1a2fdfe7b3 100644
--- a/src/plugins/tls/schannel/qtls_schannel.cpp
+++ b/src/plugins/tls/schannel/qtls_schannel.cpp
@@ -161,6 +161,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 Q_LOGGING_CATEGORY(lcTlsBackendSchannel, "qt.tlsbackend.schannel");
 
 // Defined in qsslsocket_qt.cpp.
@@ -213,7 +215,7 @@ long QSchannelBackend::tlsLibraryVersionNumber() const
 QString QSchannelBackend::tlsLibraryVersionString() const
 {
     const auto os = QOperatingSystemVersion::current();
-    return QLatin1String("Secure Channel, %1 %2.%3.%4")
+    return "Secure Channel, %1 %2.%3.%4"_L1
             .arg(os.name(),
                  QString::number(os.majorVersion()),
                  QString::number(os.minorVersion()),
@@ -227,7 +229,7 @@ long QSchannelBackend::tlsLibraryBuildVersionNumber() const
 
 QString QSchannelBackend::tlsLibraryBuildVersionString() const
 {
-    return QLatin1String("Secure Channel (NTDDI: 0x%1)")
+    return "Secure Channel (NTDDI: 0x%1)"_L1
             .arg(QString::number(NTDDI_VERSION, 16).toUpper());
 }
 
@@ -571,11 +573,11 @@ bool isCertificateAuthority(const QList<QSslCertificateExtension> &extensions)
 {
     auto it = std::find_if(extensions.cbegin(), extensions.cend(),
                            [](const QSslCertificateExtension &extension) {
-                               return extension.name() == QLatin1String("basicConstraints");
+                               return extension.name() == "basicConstraints"_L1;
                            });
     if (it != extensions.cend()) {
         QVariantMap basicConstraints = it->value().toMap();
-        return basicConstraints.value(QLatin1String("ca"), false).toBool();
+        return basicConstraints.value("ca"_L1, false).toBool();
     }
     return false;
 }
@@ -2245,7 +2247,7 @@ bool TlsCryptographSchannel::verifyCertContext(CERT_CONTEXT *certContext)
         if (element->TrustStatus.dwErrorStatus & CERT_TRUST_INVALID_BASIC_CONSTRAINTS) {
             auto it = std::find_if(extensions.cbegin(), extensions.cend(),
                                    [](const QSslCertificateExtension &extension) {
-                                       return extension.name() == QLatin1String("basicConstraints");
+                                       return extension.name() == "basicConstraints"_L1;
                                    });
             if (it != extensions.cend()) {
                 // @Note: This is actually one of two errors:
@@ -2253,7 +2255,7 @@ bool TlsCryptographSchannel::verifyCertContext(CERT_CONTEXT *certContext)
                 // or the chain path length has been exceeded."
                 QVariantMap basicConstraints = it->value().toMap();
                 QSslError error;
-                if (i > 0 && !basicConstraints.value(QLatin1String("ca"), false).toBool())
+                if (i > 0 && !basicConstraints.value("ca"_L1, false).toBool())
                     error = QSslError(QSslError::InvalidPurpose, certificate);
                 else
                     error = QSslError(QSslError::PathLengthExceeded, certificate);
diff --git a/src/plugins/tls/securetransport/qtls_st.cpp b/src/plugins/tls/securetransport/qtls_st.cpp
index 75472888e5..60127ca885 100644
--- a/src/plugins/tls/securetransport/qtls_st.cpp
+++ b/src/plugins/tls/securetransport/qtls_st.cpp
@@ -76,6 +76,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 // Defined in qsslsocket_qt.cpp.
 QByteArray _q_makePkcs12(const QList<QSslCertificate> &certs, const QSslKey &key,
                          const QString &passPhrase);
@@ -120,7 +122,7 @@ EphemeralSecKeychain::EphemeralSecKeychain()
     const auto uuidAsString = QLatin1String(uuidAsByteArray.data(), uuidAsByteArray.size()).mid(1, uuidAsByteArray.size() - 2);
 
     const QString keychainName
-            = QDir::tempPath() + QDir::separator() + uuidAsString + QLatin1String(".keychain");
+            = QDir::tempPath() + QDir::separator() + uuidAsString + ".keychain"_L1;
     // SecKeychainCreate, pathName parameter:
     //
     // "A constant character string representing the POSIX path indicating where
@@ -575,107 +577,107 @@ void TlsCryptographSecureTransport::transmit()
 
 SSLCipherSuite TlsCryptographSecureTransport::SSLCipherSuite_from_QSslCipher(const QSslCipher &ciph)
 {
-    if (ciph.name() == QLatin1String("AES128-SHA"))
+    if (ciph.name() == "AES128-SHA"_L1)
         return TLS_RSA_WITH_AES_128_CBC_SHA;
-    if (ciph.name() == QLatin1String("DHE-RSA-AES128-SHA"))
+    if (ciph.name() == "DHE-RSA-AES128-SHA"_L1)
         return TLS_DHE_RSA_WITH_AES_128_CBC_SHA;
-    if (ciph.name() == QLatin1String("AES256-SHA"))
+    if (ciph.name() == "AES256-SHA"_L1)
         return TLS_RSA_WITH_AES_256_CBC_SHA;
-    if (ciph.name() == QLatin1String("DHE-RSA-AES256-SHA"))
+    if (ciph.name() == "DHE-RSA-AES256-SHA"_L1)
         return TLS_DHE_RSA_WITH_AES_256_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-NULL-SHA"))
+    if (ciph.name() == "ECDH-ECDSA-NULL-SHA"_L1)
         return TLS_ECDH_ECDSA_WITH_NULL_SHA;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-RC4-SHA"))
+    if (ciph.name() == "ECDH-ECDSA-RC4-SHA"_L1)
         return TLS_ECDH_ECDSA_WITH_RC4_128_SHA;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-DES-CBC3-SHA"))
+    if (ciph.name() == "ECDH-ECDSA-DES-CBC3-SHA"_L1)
         return TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-AES128-SHA"))
+    if (ciph.name() == "ECDH-ECDSA-AES128-SHA"_L1)
         return TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-AES256-SHA"))
+    if (ciph.name() == "ECDH-ECDSA-AES256-SHA"_L1)
         return TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-RC4-SHA"))
+    if (ciph.name() == "ECDH-ECDSA-RC4-SHA"_L1)
         return TLS_ECDHE_ECDSA_WITH_RC4_128_SHA;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-DES-CBC3-SHA"))
+    if (ciph.name() == "ECDH-ECDSA-DES-CBC3-SHA"_L1)
         return TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-AES128-SHA"))
+    if (ciph.name() == "ECDH-ECDSA-AES128-SHA"_L1)
         return TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-AES256-SHA"))
+    if (ciph.name() == "ECDH-ECDSA-AES256-SHA"_L1)
         return TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-RSA-NULL-SHA"))
+    if (ciph.name() == "ECDH-RSA-NULL-SHA"_L1)
         return TLS_ECDH_RSA_WITH_NULL_SHA;
-    if (ciph.name() == QLatin1String("ECDH-RSA-RC4-SHA"))
+    if (ciph.name() == "ECDH-RSA-RC4-SHA"_L1)
         return TLS_ECDH_RSA_WITH_RC4_128_SHA;
-    if (ciph.name() == QLatin1String("ECDH-RSA-DES-CBC3-SHA"))
+    if (ciph.name() == "ECDH-RSA-DES-CBC3-SHA"_L1)
         return TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-RSA-AES128-SHA"))
+    if (ciph.name() == "ECDH-RSA-AES128-SHA"_L1)
         return TLS_ECDH_RSA_WITH_AES_128_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-RSA-AES256-SHA"))
+    if (ciph.name() == "ECDH-RSA-AES256-SHA"_L1)
         return TLS_ECDH_RSA_WITH_AES_256_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-RSA-RC4-SHA"))
+    if (ciph.name() == "ECDH-RSA-RC4-SHA"_L1)
         return TLS_ECDHE_RSA_WITH_RC4_128_SHA;
-    if (ciph.name() == QLatin1String("ECDH-RSA-DES-CBC3-SHA"))
+    if (ciph.name() == "ECDH-RSA-DES-CBC3-SHA"_L1)
         return TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-RSA-AES128-SHA"))
+    if (ciph.name() == "ECDH-RSA-AES128-SHA"_L1)
         return TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA;
-    if (ciph.name() == QLatin1String("ECDH-RSA-AES256-SHA"))
+    if (ciph.name() == "ECDH-RSA-AES256-SHA"_L1)
         return TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA;
-    if (ciph.name() == QLatin1String("DES-CBC3-SHA"))
+    if (ciph.name() == "DES-CBC3-SHA"_L1)
         return TLS_RSA_WITH_3DES_EDE_CBC_SHA;
-    if (ciph.name() == QLatin1String("AES128-SHA256"))
+    if (ciph.name() == "AES128-SHA256"_L1)
         return TLS_RSA_WITH_AES_128_CBC_SHA256;
-    if (ciph.name() == QLatin1String("AES256-SHA256"))
+    if (ciph.name() == "AES256-SHA256"_L1)
         return TLS_RSA_WITH_AES_256_CBC_SHA256;
-    if (ciph.name() == QLatin1String("DHE-RSA-DES-CBC3-SHA"))
+    if (ciph.name() == "DHE-RSA-DES-CBC3-SHA"_L1)
         return TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA;
-    if (ciph.name() == QLatin1String("DHE-RSA-AES128-SHA256"))
+    if (ciph.name() == "DHE-RSA-AES128-SHA256"_L1)
         return TLS_DHE_RSA_WITH_AES_128_CBC_SHA256;
-    if (ciph.name() == QLatin1String("DHE-RSA-AES256-SHA256"))
+    if (ciph.name() == "DHE-RSA-AES256-SHA256"_L1)
         return TLS_DHE_RSA_WITH_AES_256_CBC_SHA256;
-    if (ciph.name() == QLatin1String("AES256-GCM-SHA384"))
+    if (ciph.name() == "AES256-GCM-SHA384"_L1)
         return TLS_RSA_WITH_AES_256_GCM_SHA384;
-    if (ciph.name() == QLatin1String("ECDHE-ECDSA-AES128-SHA256"))
+    if (ciph.name() == "ECDHE-ECDSA-AES128-SHA256"_L1)
         return TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256;
-    if (ciph.name() == QLatin1String("ECDHE-ECDSA-AES256-SHA384"))
+    if (ciph.name() == "ECDHE-ECDSA-AES256-SHA384"_L1)
         return TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-AES128-SHA256"))
+    if (ciph.name() == "ECDH-ECDSA-AES128-SHA256"_L1)
         return TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-AES256-SHA384"))
+    if (ciph.name() == "ECDH-ECDSA-AES256-SHA384"_L1)
         return TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384;
-    if (ciph.name() == QLatin1String("ECDHE-RSA-AES128-SHA256"))
+    if (ciph.name() == "ECDHE-RSA-AES128-SHA256"_L1)
         return TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256;
-    if (ciph.name() == QLatin1String("ECDHE-RSA-AES256-SHA384"))
+    if (ciph.name() == "ECDHE-RSA-AES256-SHA384"_L1)
         return TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384;
-    if (ciph.name() == QLatin1String("ECDHE-RSA-AES256-SHA384"))
+    if (ciph.name() == "ECDHE-RSA-AES256-SHA384"_L1)
         return TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256;
-    if (ciph.name() == QLatin1String("ECDHE-RSA-AES256-GCM-SHA384"))
+    if (ciph.name() == "ECDHE-RSA-AES256-GCM-SHA384"_L1)
         return TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384;
-    if (ciph.name() == QLatin1String("AES128-GCM-SHA256"))
+    if (ciph.name() == "AES128-GCM-SHA256"_L1)
         return TLS_AES_128_GCM_SHA256;
-    if (ciph.name() == QLatin1String("AES256-GCM-SHA384"))
+    if (ciph.name() == "AES256-GCM-SHA384"_L1)
         return TLS_AES_256_GCM_SHA384;
-    if (ciph.name() == QLatin1String("CHACHA20-POLY1305-SHA256"))
+    if (ciph.name() == "CHACHA20-POLY1305-SHA256"_L1)
         return TLS_CHACHA20_POLY1305_SHA256;
-    if (ciph.name() == QLatin1String("AES128-CCM-SHA256"))
+    if (ciph.name() == "AES128-CCM-SHA256"_L1)
         return TLS_AES_128_CCM_SHA256;
-    if (ciph.name() == QLatin1String("AES128-CCM8-SHA256"))
+    if (ciph.name() == "AES128-CCM8-SHA256"_L1)
         return TLS_AES_128_CCM_8_SHA256;
-    if (ciph.name() == QLatin1String("ECDHE-ECDSA-AES128-GCM-SHA256"))
+    if (ciph.name() == "ECDHE-ECDSA-AES128-GCM-SHA256"_L1)
         return TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256;
-    if (ciph.name() == QLatin1String("ECDHE-ECDSA-AES256-GCM-SHA384"))
+    if (ciph.name() == "ECDHE-ECDSA-AES256-GCM-SHA384"_L1)
         return TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-AES128-GCM-SHA256"))
+    if (ciph.name() == "ECDH-ECDSA-AES128-GCM-SHA256"_L1)
         return TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256;
-    if (ciph.name() == QLatin1String("ECDH-ECDSA-AES256-GCM-SHA384"))
+    if (ciph.name() == "ECDH-ECDSA-AES256-GCM-SHA384"_L1)
         return TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384;
-    if (ciph.name() == QLatin1String("ECDHE-RSA-AES128-GCM-SHA256"))
+    if (ciph.name() == "ECDHE-RSA-AES128-GCM-SHA256"_L1)
         return TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256;
-    if (ciph.name() == QLatin1String("ECDH-RSA-AES128-GCM-SHA256"))
+    if (ciph.name() == "ECDH-RSA-AES128-GCM-SHA256"_L1)
         return TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256;
-    if (ciph.name() == QLatin1String("ECDH-RSA-AES256-GCM-SHA384"))
+    if (ciph.name() == "ECDH-RSA-AES256-GCM-SHA384"_L1)
         return TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384;
-    if (ciph.name() == QLatin1String("ECDHE-RSA-CHACHA20-POLY1305-SHA256"))
+    if (ciph.name() == "ECDHE-RSA-CHACHA20-POLY1305-SHA256"_L1)
         return TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256;
-    if (ciph.name() == QLatin1String("ECDHE-ECDSA-CHACHA20-POLY1305-SHA256"))
+    if (ciph.name() == "ECDHE-ECDSA-CHACHA20-POLY1305-SHA256"_L1)
         return TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256;
 
     return 0;
diff --git a/src/plugins/tls/securetransport/qtlsbackend_st.cpp b/src/plugins/tls/securetransport/qtlsbackend_st.cpp
index a0532b49df..ce7accdb78 100644
--- a/src/plugins/tls/securetransport/qtlsbackend_st.cpp
+++ b/src/plugins/tls/securetransport/qtlsbackend_st.cpp
@@ -47,6 +47,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 Q_GLOBAL_STATIC(QRecursiveMutex, qt_securetransport_mutex)
 
 Q_LOGGING_CATEGORY(lcSecureTransport, "qt.tlsbackend.securetransport");
@@ -64,98 +66,98 @@ QSslCipher QSslCipher_from_SSLCipherSuite(SSLCipherSuite cipher)
     // Sorted as in CipherSuite.h (and groupped by their RFC)
     // TLS addenda using AES, per RFC 3268
     case TLS_RSA_WITH_AES_128_CBC_SHA:
-        name = QLatin1String("AES128-SHA");
+        name = "AES128-SHA"_L1;
         break;
     case TLS_DHE_RSA_WITH_AES_128_CBC_SHA:
-        name = QLatin1String("DHE-RSA-AES128-SHA");
+        name = "DHE-RSA-AES128-SHA"_L1;
         break;
     case TLS_RSA_WITH_AES_256_CBC_SHA:
-        name = QLatin1String("AES256-SHA");
+        name = "AES256-SHA"_L1;
         break;
     case TLS_DHE_RSA_WITH_AES_256_CBC_SHA:
-        name = QLatin1String("DHE-RSA-AES256-SHA");
+        name = "DHE-RSA-AES256-SHA"_L1;
         break;
 
     // ECDSA addenda, RFC 4492
     case TLS_ECDH_ECDSA_WITH_NULL_SHA:
-        name = QLatin1String("ECDH-ECDSA-NULL-SHA");
+        name = "ECDH-ECDSA-NULL-SHA"_L1;
         break;
     case TLS_ECDH_ECDSA_WITH_RC4_128_SHA:
-        name = QLatin1String("ECDH-ECDSA-RC4-SHA");
+        name = "ECDH-ECDSA-RC4-SHA"_L1;
         break;
     case TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA:
-        name = QLatin1String("ECDH-ECDSA-DES-CBC3-SHA");
+        name = "ECDH-ECDSA-DES-CBC3-SHA"_L1;
         break;
     case TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA:
-        name = QLatin1String("ECDH-ECDSA-AES128-SHA");
+        name = "ECDH-ECDSA-AES128-SHA"_L1;
         break;
     case TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA:
-        name = QLatin1String("ECDH-ECDSA-AES256-SHA");
+        name = "ECDH-ECDSA-AES256-SHA"_L1;
         break;
     case TLS_ECDHE_ECDSA_WITH_NULL_SHA:
-        name = QLatin1String("ECDHE-ECDSA-NULL-SHA");
+        name = "ECDHE-ECDSA-NULL-SHA"_L1;
         break;
     case TLS_ECDHE_ECDSA_WITH_RC4_128_SHA:
-        name = QLatin1String("ECDHE-ECDSA-RC4-SHA");
+        name = "ECDHE-ECDSA-RC4-SHA"_L1;
         break;
     case TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA:
-        name = QLatin1String("ECDHE-ECDSA-DES-CBC3-SHA");
+        name = "ECDHE-ECDSA-DES-CBC3-SHA"_L1;
         break;
     case TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA:
-        name = QLatin1String("ECDHE-ECDSA-AES128-SHA");
+        name = "ECDHE-ECDSA-AES128-SHA"_L1;
         break;
     case TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA:
-        name = QLatin1String("ECDHE-ECDSA-AES256-SHA");
+        name = "ECDHE-ECDSA-AES256-SHA"_L1;
         break;
     case TLS_ECDH_RSA_WITH_NULL_SHA:
-        name = QLatin1String("ECDH-RSA-NULL-SHA");
+        name = "ECDH-RSA-NULL-SHA"_L1;
         break;
     case TLS_ECDH_RSA_WITH_RC4_128_SHA:
-        name = QLatin1String("ECDH-RSA-RC4-SHA");
+        name = "ECDH-RSA-RC4-SHA"_L1;
         break;
     case TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA:
-        name = QLatin1String("ECDH-RSA-DES-CBC3-SHA");
+        name = "ECDH-RSA-DES-CBC3-SHA"_L1;
         break;
     case TLS_ECDH_RSA_WITH_AES_128_CBC_SHA:
-        name = QLatin1String("ECDH-RSA-AES128-SHA");
+        name = "ECDH-RSA-AES128-SHA"_L1;
         break;
     case TLS_ECDH_RSA_WITH_AES_256_CBC_SHA:
-        name = QLatin1String("ECDH-RSA-AES256-SHA");
+        name = "ECDH-RSA-AES256-SHA"_L1;
         break;
     case TLS_ECDHE_RSA_WITH_NULL_SHA:
-        name = QLatin1String("ECDHE-RSA-NULL-SHA");
+        name = "ECDHE-RSA-NULL-SHA"_L1;
         break;
     case TLS_ECDHE_RSA_WITH_RC4_128_SHA:
-        name = QLatin1String("ECDHE-RSA-RC4-SHA");
+        name = "ECDHE-RSA-RC4-SHA"_L1;
         break;
     case TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA:
-        name = QLatin1String("ECDHE-RSA-DES-CBC3-SHA");
+        name = "ECDHE-RSA-DES-CBC3-SHA"_L1;
         break;
     case TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA:
-        name = QLatin1String("ECDHE-RSA-AES128-SHA");
+        name = "ECDHE-RSA-AES128-SHA"_L1;
         break;
     case TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:
-        name = QLatin1String("ECDHE-RSA-AES256-SHA");
+        name = "ECDHE-RSA-AES256-SHA"_L1;
         break;
 
     // TLS 1.2 addenda, RFC 5246
     case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
-        name = QLatin1String("DES-CBC3-SHA");
+        name = "DES-CBC3-SHA"_L1;
         break;
     case TLS_RSA_WITH_AES_128_CBC_SHA256:
-        name = QLatin1String("AES128-SHA256");
+        name = "AES128-SHA256"_L1;
         break;
     case TLS_RSA_WITH_AES_256_CBC_SHA256:
-        name = QLatin1String("AES256-SHA256");
+        name = "AES256-SHA256"_L1;
         break;
     case TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA:
-        name = QLatin1String("DHE-RSA-DES-CBC3-SHA");
+        name = "DHE-RSA-DES-CBC3-SHA"_L1;
         break;
     case TLS_DHE_RSA_WITH_AES_128_CBC_SHA256:
-        name = QLatin1String("DHE-RSA-AES128-SHA256");
+        name = "DHE-RSA-AES128-SHA256"_L1;
         break;
     case TLS_DHE_RSA_WITH_AES_256_CBC_SHA256:
-        name = QLatin1String("DHE-RSA-AES256-SHA256");
+        name = "DHE-RSA-AES256-SHA256"_L1;
         break;
 
     // Addendum from RFC 4279, TLS PSK
@@ -166,7 +168,7 @@ QSslCipher QSslCipher_from_SSLCipherSuite(SSLCipherSuite cipher)
 
     // Addenda from rfc 5288 AES Galois Counter Mode (CGM) Cipher Suites for TLS
     case TLS_RSA_WITH_AES_256_GCM_SHA384:
-        name = QLatin1String("AES256-GCM-SHA384");
+        name = "AES256-GCM-SHA384"_L1;
         break;
 
     // RFC 5487 - PSK with SHA-256/384 and AES GCM
@@ -174,90 +176,90 @@ QSslCipher QSslCipher_from_SSLCipherSuite(SSLCipherSuite cipher)
 
     // Addenda from rfc 5289 Elliptic Curve Cipher Suites with HMAC SHA-256/384
     case TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256:
-        name = QLatin1String("ECDHE-ECDSA-AES128-SHA256");
+        name = "ECDHE-ECDSA-AES128-SHA256"_L1;
         break;
     case TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384:
-        name = QLatin1String("ECDHE-ECDSA-AES256-SHA384");
+        name = "ECDHE-ECDSA-AES256-SHA384"_L1;
         break;
     case TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256:
-        name = QLatin1String("ECDH-ECDSA-AES128-SHA256");
+        name = "ECDH-ECDSA-AES128-SHA256"_L1;
         break;
     case TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384:
-        name = QLatin1String("ECDH-ECDSA-AES256-SHA384");
+        name = "ECDH-ECDSA-AES256-SHA384"_L1;
         break;
     case TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256:
-        name = QLatin1String("ECDHE-RSA-AES128-SHA256");
+        name = "ECDHE-RSA-AES128-SHA256"_L1;
         break;
     case TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384:
-        name = QLatin1String("ECDHE-RSA-AES256-SHA384");
+        name = "ECDHE-RSA-AES256-SHA384"_L1;
         break;
     case TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256:
-        name = QLatin1String("ECDH-RSA-AES128-SHA256");
+        name = "ECDH-RSA-AES128-SHA256"_L1;
         break;
     case TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384:
-        name = QLatin1String("ECDH-RSA-AES256-SHA384");
+        name = "ECDH-RSA-AES256-SHA384"_L1;
         break;
 
     // Addenda from rfc 5289 Elliptic Curve Cipher Suites
     // with SHA-256/384 and AES Galois Counter Mode (GCM)
     case TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384:
-        name = QLatin1String("ECDHE-RSA-AES256-GCM-SHA384");
+        name = "ECDHE-RSA-AES256-GCM-SHA384"_L1;
         break;
 
     // TLS 1.3 standard cipher suites for ChaCha20+Poly1305.
     // Note: TLS 1.3 ciphersuites do not specify the key exchange
     // algorithm -- they only specify the symmetric ciphers.
     case TLS_AES_128_GCM_SHA256:
-        name = QLatin1String("AES128-GCM-SHA256");
+        name = "AES128-GCM-SHA256"_L1;
         break;
     case TLS_AES_256_GCM_SHA384:
-        name = QLatin1String("AES256-GCM-SHA384");
+        name = "AES256-GCM-SHA384"_L1;
         break;
     case TLS_CHACHA20_POLY1305_SHA256:
-        name = QLatin1String("CHACHA20-POLY1305-SHA256");
+        name = "CHACHA20-POLY1305-SHA256"_L1;
         break;
     case TLS_AES_128_CCM_SHA256:
-        name = QLatin1String("AES128-CCM-SHA256");
+        name = "AES128-CCM-SHA256"_L1;
         break;
     case TLS_AES_128_CCM_8_SHA256:
-        name = QLatin1String("AES128-CCM8-SHA256");
+        name = "AES128-CCM8-SHA256"_L1;
         break;
     // Addenda from rfc 5289  Elliptic Curve Cipher Suites with
     // SHA-256/384 and AES Galois Counter Mode (GCM).
     case TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256:
-        name = QLatin1String("ECDHE-ECDSA-AES128-GCM-SHA256");
+        name = "ECDHE-ECDSA-AES128-GCM-SHA256"_L1;
         break;
     case TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384:
-        name = QLatin1String("ECDHE-ECDSA-AES256-GCM-SHA384");
+        name = "ECDHE-ECDSA-AES256-GCM-SHA384"_L1;
         break;
     case TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256:
-        name = QLatin1String("ECDH-ECDSA-AES128-GCM-SHA256");
+        name = "ECDH-ECDSA-AES128-GCM-SHA256"_L1;
         break;
     case TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384:
-        name = QLatin1String("ECDH-ECDSA-AES256-GCM-SHA384");
+        name = "ECDH-ECDSA-AES256-GCM-SHA384"_L1;
         break;
     case TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256:
-        name = QLatin1String("ECDHE-RSA-AES128-GCM-SHA256");
+        name = "ECDHE-RSA-AES128-GCM-SHA256"_L1;
         break;
     case TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256:
-        name = QLatin1String("ECDH-RSA-AES128-GCM-SHA256");
+        name = "ECDH-RSA-AES128-GCM-SHA256"_L1;
         break;
     case TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384:
-        name = QLatin1String("ECDH-RSA-AES256-GCM-SHA384");
+        name = "ECDH-RSA-AES256-GCM-SHA384"_L1;
         break;
     // Addenda from rfc 7905  ChaCha20-Poly1305 Cipher Suites for
     // Transport Layer Security (TLS).
     case TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256:
-        name = QLatin1String("ECDHE-RSA-CHACHA20-POLY1305-SHA256");
+        name = "ECDHE-RSA-CHACHA20-POLY1305-SHA256"_L1;
         break;
     case TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256:
-        name = QLatin1String("ECDHE-ECDSA-CHACHA20-POLY1305-SHA256");
+        name = "ECDHE-ECDSA-CHACHA20-POLY1305-SHA256"_L1;
         break;
     default:
         return {};
     }
 
-    return QTlsBackend::createCiphersuite(name, QSsl::TlsV1_2, QLatin1String("TLSv1.2"));
+    return QTlsBackend::createCiphersuite(name, QSsl::TlsV1_2, "TLSv1.2"_L1);
 }
 
 } // namespace QTlsPrivate
@@ -266,7 +268,7 @@ bool QSecureTransportBackend::s_loadedCiphersAndCerts = false;
 
 QString QSecureTransportBackend::tlsLibraryVersionString() const
 {
-    return QLatin1String("Secure Transport, ") + QSysInfo::prettyProductName();
+    return "Secure Transport, "_L1 + QSysInfo::prettyProductName();
 }
 
 QString QSecureTransportBackend::tlsLibraryBuildVersionString() const
diff --git a/src/plugins/tls/shared/qx509_generic.cpp b/src/plugins/tls/shared/qx509_generic.cpp
index 5e06c765e1..f92bd1214e 100644
--- a/src/plugins/tls/shared/qx509_generic.cpp
+++ b/src/plugins/tls/shared/qx509_generic.cpp
@@ -52,6 +52,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using namespace Qt::StringLiterals;
+
 namespace QTlsPrivate {
 
 namespace {
@@ -291,7 +293,7 @@ bool X509CertificateGeneric::parse(const QByteArray &data)
                     if (!parseExtension(elem.value(), extension))
                         return false;
 
-                    if (extension.oid == QLatin1String("2.5.29.17")) {
+                    if (extension.oid == "2.5.29.17"_L1) {
                         // subjectAltName
 
                         // Note, parseExtension() returns true for this extensions,