1 files changed, 8 insertions, 4 deletions
diff --git a/src/webenginewidgets/api/qwebengineprofile.cpp b/src/webenginewidgets/api/qwebengineprofile.cpp
index 4523a425a..6969000a8 100644
--- a/src/webenginewidgets/api/qwebengineprofile.cpp
+++ b/src/webenginewidgets/api/qwebengineprofile.cpp
@@ -680,22 +680,26 @@ static bool checkInternalScheme(const QByteArray &scheme)
     \since 5.6
 
     Registers a handler \a handler for custom URL scheme \a scheme in the profile.
+
+    It is recommended to first register the scheme with \l
+    QWebEngineUrlScheme::addScheme at application startup.
 */
 void QWebEngineProfile::installUrlSchemeHandler(const QByteArray &scheme, QWebEngineUrlSchemeHandler *handler)
 {
     Q_D(QWebEngineProfile);
     Q_ASSERT(handler);
-    if (checkInternalScheme(scheme)) {
+    QByteArray canonicalScheme = scheme.toLower();
+    if (checkInternalScheme(canonicalScheme)) {
         qWarning("Cannot install a URL scheme handler overriding internal scheme: %s", scheme.constData());
         return;
     }
 
-    if (d->profileAdapter()->customUrlSchemeHandlers().contains(scheme)) {
-        if (d->profileAdapter()->customUrlSchemeHandlers().value(scheme) != handler)
+    if (d->profileAdapter()->customUrlSchemeHandlers().contains(canonicalScheme)) {
+        if (d->profileAdapter()->customUrlSchemeHandlers().value(canonicalScheme) != handler)
             qWarning("URL scheme handler already installed for the scheme: %s", scheme.constData());
         return;
     }
-    d->profileAdapter()->addCustomUrlSchemeHandler(scheme, handler);
+    d->profileAdapter()->addCustomUrlSchemeHandler(canonicalScheme, handler);
     connect(handler, SIGNAL(_q_destroyedUrlSchemeHandler(QWebEngineUrlSchemeHandler*)), this, SLOT(destroyedUrlSchemeHandler(QWebEngineUrlSchemeHandler*)));
 }