Doc: Centralize RFC documentation-links in rfc.qdoc

In the effort of repairing broken links as per QTBUG-96127,
a series of RFC links referring to `tools.ietf.org/html/*` were modified
to point to the new address that the site redirected to.

To simplify executing a similar task and to diminish the duplication of
manually inserted urls, the already existing `rfc.qdoc` file, containing
`\externalpage` commands directing to RFC locations, was enhanced with
links to all RFCs that were mentioned in the current documentation, so
as to aggregate this common category of links.

All links pointing to a `ietf` domain inside QDoc documentation blocks
were then changed to use the newly provided external-references.

Task-number: QTBUG-96127
Pick-to: 6.2
Change-Id: I2a52eb6aa8c9e346f64ef1a627b039220d9f6c2a
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

20 files changed, 36 insertions, 43 deletions

diff --git a/src/corelib/doc/src/external-resources.qdoc b/src/corelib/doc/src/external-resources.qdoc
index 62e6b7ea1d..50a19a4e09 100644
--- a/src/corelib/doc/src/external-resources.qdoc
+++ b/src/corelib/doc/src/external-resources.qdoc
@@ -47,11 +47,6 @@
 */
 
 /*!
-    \externalpage http://www.ietf.org/rfc/rfc4648.txt
-    \title RFC 4648
-*/
-
-/*!
     \externalpage http://www.iana.org/assignments/character-sets/character-sets.xml
     \title IANA character-sets encoding file
 */
diff --git a/src/corelib/doc/src/json.qdoc b/src/corelib/doc/src/json.qdoc
index 2a7d5a702b..9b1070ec67 100644
--- a/src/corelib/doc/src/json.qdoc
+++ b/src/corelib/doc/src/json.qdoc
@@ -43,7 +43,7 @@
     modify and save JSON data.
 
     More details about the JSON data format can be found at \l{http://json.org}{json.org}
-    and in \l{https://datatracker.ietf.org/doc/html/rfc4627}{RFC-4627}.
+    and in \l {RFC 4627}.
 
     \tableofcontents
 
diff --git a/src/corelib/io/qurl.cpp b/src/corelib/io/qurl.cpp
index b5b4c653cd..6333ee3c84 100644
--- a/src/corelib/io/qurl.cpp
+++ b/src/corelib/io/qurl.cpp
@@ -1958,7 +1958,7 @@ void QUrl::setUrl(const QString &url, ParsingMode parsingMode)
     The scheme describes the type (or protocol) of the URL. It's
     represented by one or more ASCII characters at the start the URL.
 
-    A scheme is strictly \l {http://www.ietf.org/rfc/rfc3986.txt} {RFC 3986}-compliant:
+    A scheme is strictly \l {RFC 3986}-compliant:
         \tt {scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )}
 
     The following example shows a URL where the scheme is "ftp":
diff --git a/src/corelib/plugin/quuid.cpp b/src/corelib/plugin/quuid.cpp
index b41af5c4f2..7f7d537fe4 100644
--- a/src/corelib/plugin/quuid.cpp
+++ b/src/corelib/plugin/quuid.cpp
@@ -286,7 +286,7 @@ static QUuid createFromName(const QUuid &ns, const QByteArray &baseData, QCrypto
     \endtable
 
     The field layouts for the DCE versions listed in the table above
-    are specified in the \l{http://www.ietf.org/rfc/rfc4122.txt}
+    are specified in the \l{RFC 4122}
     {Network Working Group UUID Specification}.
 
     Most platforms provide a tool for generating new UUIDs, e.g. \c
diff --git a/src/corelib/serialization/qcborarray.cpp b/src/corelib/serialization/qcborarray.cpp
index 2e0de4f4fc..11f469dc86 100644
--- a/src/corelib/serialization/qcborarray.cpp
+++ b/src/corelib/serialization/qcborarray.cpp
@@ -59,7 +59,7 @@ using namespace QtCbor;
     binary data encoding that is a superset of JSON. It was created by the IETF
     Constrained RESTful Environments (CoRE) WG, which has used it in many new
     RFCs. It is meant to be used alongside the
-    \l{https://tools.ietf.org/html/rfc7252}{CoAP protocol}.
+    \l{RFC 7252}{CoAP protocol}.
 
     QCborArray is very similar to \l QVariantList and \l QJsonArray and its API
     is almost identical to those two classes. It can also be converted to and
diff --git a/src/corelib/serialization/qcborcommon.cpp b/src/corelib/serialization/qcborcommon.cpp
index 4f102c3b95..40caf9e3a4 100644
--- a/src/corelib/serialization/qcborcommon.cpp
+++ b/src/corelib/serialization/qcborcommon.cpp
@@ -153,11 +153,11 @@ QDataStream &operator>>(QDataStream &ds, QCborSimpleType &st)
                                 is the exponent of the power of 10, the second the integral
                                 mantissa. The value 273.15 would be encoded as array \c{[-2, 27315]}.
    \value Bigfloat              Similar to Decimal, but the exponent is a power of 2 instead.
-   \value COSE_Encrypt0         An \c Encrypt0 map as specified by \l{https://tools.ietf.org/html/rfc8152}{RFC 8152}
+   \value COSE_Encrypt0         An \c Encrypt0 map as specified by \l{RFC 8152}
                                 (CBOR Object Signing and Encryption).
-   \value COSE_Mac0             A \c Mac0 map as specified by \l{https://tools.ietf.org/html/rfc8152}{RFC 8152}
+   \value COSE_Mac0             A \c Mac0 map as specified by \l{RFC 8152}
                                 (CBOR Object Signing and Encryption).
-   \value COSE_Sign1            A \c Sign1 map as specified by \l{https://tools.ietf.org/html/rfc8152}{RFC 8152}
+   \value COSE_Sign1            A \c Sign1 map as specified by \l{RFC 8152}
                                 (CBOR Object Signing and Encryption).
    \value ExpectedBase64url     Indicates that the byte array should be encoded using Base64url
                                 if the stream is converted to JSON.
@@ -172,13 +172,13 @@ QDataStream &operator>>(QDataStream &ds, QCborSimpleType &st)
    \value RegularExpression     Indicates that the string contains a Perl-Compatible Regular
                                 Expression pattern.
    \value MimeMessage           Indicates that the string contains a MIME message (according to
-                                \l{https://tools.ietf.org/html/rfc2045}){RFC 2045}.
+                                \l{RFC 2045}).
    \value Uuid                  Indicates that the byte array contains a UUID.
-   \value COSE_Encrypt          An \c Encrypt map as specified by \l{https://tools.ietf.org/html/rfc8152}{RFC 8152}
+   \value COSE_Encrypt          An \c Encrypt map as specified by \l{RFC 8152}
                                 (CBOR Object Signing and Encryption).
-   \value COSE_Mac              A \c Mac map as specified by \l{https://tools.ietf.org/html/rfc8152}{RFC 8152}
+   \value COSE_Mac              A \c Mac map as specified by \l{RFC 8152}
                                 (CBOR Object Signing and Encryption).
-   \value COSE_Sign             A \c Sign map as specified by \l{https://tools.ietf.org/html/rfc8152}{RFC 8152}
+   \value COSE_Sign             A \c Sign map as specified by \l{RFC 8152}
                                 (CBOR Object Signing and Encryption).
    \value Signature             No change in interpretation; this tag can be used as the outermost
                                 tag in a CBOR stream as the file header.
diff --git a/src/corelib/serialization/qcbordiagnostic.cpp b/src/corelib/serialization/qcbordiagnostic.cpp
index 2e92dab0a4..b7d8f1ed6b 100644
--- a/src/corelib/serialization/qcbordiagnostic.cpp
+++ b/src/corelib/serialization/qcbordiagnostic.cpp
@@ -326,7 +326,7 @@ void DiagnosticNotation::appendValue(const QCborValue &v)
     would be possible.
 
     CBOR diagnostic notation is specified by
-    \l{https://tools.ietf.org/html/rfc7049#section-6}{section 6} of RFC 7049.
+    \l{RFC 7049, section 6}{section 6} of RFC 7049.
     It is a text representation of the CBOR stream and it is very similar to
     JSON, but it supports the CBOR types not found in JSON. The extended format
     enabled by the \l{DiagnosticNotationOption}{ExtendedFormat} flag is
diff --git a/src/corelib/serialization/qcbormap.cpp b/src/corelib/serialization/qcbormap.cpp
index 34c8c72059..2ffd0e1025 100644
--- a/src/corelib/serialization/qcbormap.cpp
+++ b/src/corelib/serialization/qcbormap.cpp
@@ -58,7 +58,7 @@ using namespace QtCbor;
     Representation, a very compact form of binary data encoding that is a
     superset of JSON. It was created by the IETF Constrained RESTful
     Environments (CoRE) WG, which has used it in many new RFCs. It is meant to
-    be used alongside the \l{https://tools.ietf.org/html/rfc7252}{CoAP
+    be used alongside the \l{RFC 7252}{CoAP
     protocol}.
 
     Unlike JSON and \l QVariantMap, CBOR map keys can be of any type, not just
diff --git a/src/corelib/serialization/qcborstreamreader.cpp b/src/corelib/serialization/qcborstreamreader.cpp
index 8e42efb0cc..551d083d11 100644
--- a/src/corelib/serialization/qcborstreamreader.cpp
+++ b/src/corelib/serialization/qcborstreamreader.cpp
@@ -109,7 +109,7 @@ static_assert(int(QCborStreamReader::Invalid) == CborInvalidType);
    Representation, a very compact form of binary data encoding that is
    compatible with JSON. It was created by the IETF Constrained RESTful
    Environments (CoRE) WG, which has used it in many new RFCs. It is meant to
-   be used alongside the \l{https://tools.ietf.org/html/rfc7252}{CoAP
+   be used alongside the \l{RFC 7252}{CoAP
    protocol}.
 
    QCborStreamReader provides a StAX-like API, similar to that of
diff --git a/src/corelib/serialization/qcborstreamwriter.cpp b/src/corelib/serialization/qcborstreamwriter.cpp
index ff6cbbec00..d3c0066cca 100644
--- a/src/corelib/serialization/qcborstreamwriter.cpp
+++ b/src/corelib/serialization/qcborstreamwriter.cpp
@@ -92,8 +92,7 @@ Q_DECLARE_TYPEINFO(CborEncoder, Q_PRIMITIVE_TYPE);
    Representation, a very compact form of binary data encoding that is
    compatible with JSON. It was created by the IETF Constrained RESTful
    Environments (CoRE) WG, which has used it in many new RFCs. It is meant to
-   be used alongside the \l{https://tools.ietf.org/html/rfc7252}{CoAP
-   protocol}.
+   be used alongside the \l{RFC 7252}{CoAP protocol}.
 
    QCborStreamWriter provides a StAX-like API, similar to that of
    \l{QXmlStreamWriter}. It is rather low-level and requires a bit of knowledge
@@ -123,7 +122,7 @@ Q_DECLARE_TYPEINFO(CborEncoder, Q_PRIMITIVE_TYPE);
 
    QCborStreamWriter supports all CBOR features required to create canonical
    and strict streams. It implements almost all of the features specified in
-   \l {https://tools.ietf.org/html/rfc7049}{RFC 7049}.
+   \l {RFC 7049}.
 
    The following table lists the CBOR features that QCborStreamWriter supports.
 
@@ -151,7 +150,7 @@ Q_DECLARE_TYPEINFO(CborEncoder, Q_PRIMITIVE_TYPE);
    \section2 Canonical CBOR encoding
 
    Canonical CBOR encoding is defined by
-   \l{https://tools.ietf.org/html/rfc7049#section-3.9}{Section 3.9 of RFC
+   \l{RFC 7049, section 3.9}{Section 3.9 of RFC
    7049}. Canonical encoding is not a requirement for Qt's CBOR decoding
    functionality, but it may be required for some protocols. In particular,
    protocols that require the ability to reproduce the same stream identically
@@ -181,7 +180,7 @@ Q_DECLARE_TYPEINFO(CborEncoder, Q_PRIMITIVE_TYPE);
    \section2 Strict CBOR mode
 
    Strict mode is defined by
-   \l{https://tools.ietf.org/html/rfc7049#section-3.10}{Section 3.10 of RFC
+   \l{RFC 7049, section 3.10}{Section 3.10 of RFC
    7049}. As for Canonical encoding above, QCborStreamWriter makes it possible
    to create strict CBOR streams, but does not require them or validate that
    the output is so.
diff --git a/src/corelib/serialization/qcborvalue.cpp b/src/corelib/serialization/qcborvalue.cpp
index e6146c722e..44ad348fa2 100644
--- a/src/corelib/serialization/qcborvalue.cpp
+++ b/src/corelib/serialization/qcborvalue.cpp
@@ -75,7 +75,7 @@ QT_BEGIN_NAMESPACE
     binary data encoding that is a superset of JSON. It was created by the IETF
     Constrained RESTful Environments (CoRE) WG, which has used it in many
     new RFCs. It is meant to be used alongside the
-    \l{https://tools.ietf.org/html/rfc7252}{CoAP protocol}.
+    \l{RFC 7252}{CoAP protocol}.
 
     CBOR has three groups of built-in types:
 
@@ -159,7 +159,7 @@ QT_BEGIN_NAMESPACE
 
     QCborValue supports all CBOR features required to create canonical and
     strict streams. It implements almost all of the features specified in \l
-    {https://tools.ietf.org/html/rfc7049}{RFC 7049}.
+    {RFC 7049}.
 
     The following table lists the CBOR features that QCborValue supports.
 
@@ -1283,8 +1283,8 @@ inline int QCborContainerPrivate::compareElement_helper(const QCborContainerPriv
 
     \section3 Sorting order
 
-    Sorting order in CBOR is defined in RFC 7049
-    {https://tools.ietf.org/html/rfc7049#section-3.9}{section 3.9}, which
+    Sorting order in CBOR is defined in
+    \l{RFC 7049, section 3.9}, which
     discusses the sorting of keys in a map when following the Canonical
     encoding. According to the specification, "sorting is performed on the
     bytes of the representation of the key data items" and lists as
diff --git a/src/corelib/serialization/qjsonvalue.cpp b/src/corelib/serialization/qjsonvalue.cpp
index 325e1db62e..933a8e1552 100644
--- a/src/corelib/serialization/qjsonvalue.cpp
+++ b/src/corelib/serialization/qjsonvalue.cpp
@@ -468,7 +468,7 @@ void QJsonValue::swap(QJsonValue &other) noexcept
     fails the value is replaced by a null JSON value. Note that
     QVariant::toString() is also lossy for the majority of types. For example,
     if the passed QVariant is representing raw byte array data, it is recommended
-    to pre-encode it to \l {https://www.ietf.org/rfc/rfc4648.txt}{Base64} (or
+    to pre-encode it to \l {RFC 4686}{Base64} (or
     another lossless encoding), otherwise a lossy conversion using QString::fromUtf8()
     will be used.
 
diff --git a/src/network/doc/src/ssl.qdoc b/src/network/doc/src/ssl.qdoc
index ed04e13487..2dcae744ac 100644
--- a/src/network/doc/src/ssl.qdoc
+++ b/src/network/doc/src/ssl.qdoc
@@ -72,7 +72,7 @@
     eavesdropping, tampering, or message forgery. The DTLS protocol is based on the
     stream-oriented Transport Layer Security (TLS) protocol. QtNetwork enables
     the use of DTLS with User Datagram Protocol (UDP), as defined by
-    \l {https://tools.ietf.org/html/rfc6347}{RFC 6347}.
+    \l {RFC 6347}.
 
     \section1 Import and Export Restrictions
 
diff --git a/src/network/kernel/qhostaddress.cpp b/src/network/kernel/qhostaddress.cpp
index 1418d42334..b614c65cfb 100644
--- a/src/network/kernel/qhostaddress.cpp
+++ b/src/network/kernel/qhostaddress.cpp
@@ -1143,7 +1143,7 @@ bool QHostAddress::isLoopback() const
 
     Note that IPv6 unique local unicast addresses are considered global
     addresses (see isUniqueLocalUnicast()), as are IPv4 addresses reserved for
-    local networks by \l {https://tools.ietf.org/html/rfc1918}{RFC 1918}.
+    local networks by \l {RFC 1918}.
 
     Also note that IPv6 site-local addresses are deprecated and should be
     considered as global in new applications. This function returns true for
diff --git a/src/network/kernel/qhostinfo.cpp b/src/network/kernel/qhostinfo.cpp
index fbc3248815..fdf2844447 100644
--- a/src/network/kernel/qhostinfo.cpp
+++ b/src/network/kernel/qhostinfo.cpp
@@ -234,7 +234,7 @@ bool QHostInfoResult::event(QEvent *event)
     QHostInfo::localHostName() function.
 
     QHostInfo uses the mechanisms provided by the operating system
-    to perform the lookup. As per {https://tools.ietf.org/html/rfc6724}{RFC 6724}
+    to perform the lookup. As per \l {RFC 6724}
     there is no guarantee that all IP addresses registered for a domain or
     host will be returned.
 
@@ -245,8 +245,7 @@ bool QHostInfoResult::event(QEvent *event)
     \note Since Qt 4.6.3 QHostInfo is using a small internal 60 second DNS cache
     for performance improvements.
 
-    \sa QAbstractSocket, {http://www.rfc-editor.org/rfc/rfc3492.txt}{RFC 3492},
-    {https://tools.ietf.org/html/rfc6724}{RFC 6724}
+    \sa QAbstractSocket, {RFC 3492}, {RFC 6724}
 */
 
 static int nextId()
diff --git a/src/network/ssl/qdtls.cpp b/src/network/ssl/qdtls.cpp
index e62a4b4043..e315ba9910 100644
--- a/src/network/ssl/qdtls.cpp
+++ b/src/network/ssl/qdtls.cpp
@@ -58,7 +58,7 @@
 
     The QDtlsClientVerifier class implements server-side DTLS cookie generation
     and verification. Datagram security protocols are highly susceptible to a
-    variety of Denial-of-Service attacks. According to \l {https://tools.ietf.org/html/rfc6347#section-4.2.1}{RFC 6347, section 4.2.1},
+    variety of Denial-of-Service attacks. According to \l {RFC 6347, section 4.2.1},
     these are two of the more common types of attack:
 
     \list
@@ -71,7 +71,7 @@
     which can be quite large, thus flooding the victim machine with datagrams.
     \endlist
 
-    As a countermeasure to these attacks, \l {https://tools.ietf.org/html/rfc6347#section-4.2.1}{RFC 6347, section 4.2.1}
+    As a countermeasure to these attacks, \l {RFC 6347, section 4.2.1}
     proposes a stateless cookie technique that a server may deploy:
 
     \list
@@ -119,7 +119,7 @@
 
     \note The default secret is shared by all objects of the classes QDtlsClientVerifier
     and QDtls. Since this can impose security risks, RFC 6347 recommends to change
-    the server's secret frequently. Please see \l {https://tools.ietf.org/html/rfc6347}{RFC 6347, section 4.2.1}
+    the server's secret frequently. Please see \l {RFC 6347, section 4.2.1}
     for hints about possible server implementations. Cookie generator parameters
     can be set using the class QDtlsClientVerifier::GeneratorParameters and
     setCookieGeneratorParameters():
@@ -250,7 +250,7 @@
     \warning It's recommended to call shutdown() before destroying the client's QDtls
     object if you are planning to re-use the same port number to connect to the
     server later. Otherwise, the server may drop incoming ClientHello messages,
-    see \l{https://tools.ietf.org/html/rfc6347#page-25}{RFC 6347, section 4.2.8}
+    see \l {RFC 6347, section 4.2.8}
     for more details and implementation hints.
 
     If the server does not use QDtlsClientVerifier, it \e must configure its
diff --git a/src/network/ssl/qocspresponse.cpp b/src/network/ssl/qocspresponse.cpp
index b63312506d..c69c463345 100644
--- a/src/network/ssl/qocspresponse.cpp
+++ b/src/network/ssl/qocspresponse.cpp
@@ -95,7 +95,7 @@ QT_BEGIN_NAMESPACE
     \inmodule QtNetwork
 
 
-    This enumeration describes revocation reasons, defined in \l{https://tools.ietf.org/html/rfc5280#section-5.3.1}{RFC 5280, section 5.3.1}
+    This enumeration describes revocation reasons, defined in \l{RFC 5280, section 5.3.1}
 
     \value None
     \value Unspecified
diff --git a/src/network/ssl/qpassworddigestor.cpp b/src/network/ssl/qpassworddigestor.cpp
index 706fa1de05..248336dd8e 100644
--- a/src/network/ssl/qpassworddigestor.cpp
+++ b/src/network/ssl/qpassworddigestor.cpp
@@ -60,7 +60,7 @@ namespace QPasswordDigestor {
     \since 5.12
 
     Returns a hash computed using the PBKDF1-algorithm as defined in
-    \l {https://tools.ietf.org/html/rfc8018#section-5.1} {RFC 8018}.
+    \l {RFC 8018, section 5.1}.
 
     The function takes the \a data and \a salt, and then hashes it repeatedly
     for \a iterations iterations using the specified hash \a algorithm. If the
@@ -126,7 +126,7 @@ Q_NETWORK_EXPORT QByteArray deriveKeyPbkdf1(QCryptographicHash::Algorithm algori
     \since 5.12
 
     Derive a key using the PBKDF2-algorithm as defined in
-    \l {https://tools.ietf.org/html/rfc8018#section-5.2} {RFC 8018}.
+    \l {RFC 8018, section 5.2}.
 
     This function takes the \a data and \a salt, and then applies HMAC-X, where
     the X is \a algorithm, repeatedly. It internally concatenates intermediate
diff --git a/src/network/ssl/qssl.cpp b/src/network/ssl/qssl.cpp
index 515970175e..8ece3b091f 100644
--- a/src/network/ssl/qssl.cpp
+++ b/src/network/ssl/qssl.cpp
@@ -204,7 +204,7 @@ Q_LOGGING_CATEGORY(lcSsl, "qt.network.ssl");
     \ingroup ssl
     \inmodule QtNetwork
 
-    See \l{https://tools.ietf.org/html/rfc8446#page-85}{RFC 8446, section 6}
+    See \l{RFC 8446, section 6}
     for the possible values and their meaning.
 
     \value CloseNotify,
diff --git a/src/network/ssl/qtlsbackend.cpp b/src/network/ssl/qtlsbackend.cpp
index d45deeadf1..f6a25a85cb 100644
--- a/src/network/ssl/qtlsbackend.cpp
+++ b/src/network/ssl/qtlsbackend.cpp
@@ -2083,7 +2083,7 @@ DtlsBase::~DtlsBase() = default;
     and \c false otherwise. If no valid cookie was found in the \a dgram, this verifier should use
     \a socket to send a HelloVerifyRequest message, using \a address and \a port as the destination
     and a source material for cookie generation, see also
-    \l {https://tools.ietf.org/html/rfc6347#section-4.2.1}{RFC 6347, section 4.2.1}
+    \l {RFC 6347, section 4.2.1}
 
     \sa QDtlsClientVerifier
 */