Fixed #26567 -- Updated references to obsolete RFC2616.

Didn't touch comments where it wasn't obvious that the code adhered to
the newer standard.

docs/topics/cache.txt

@@ -1127,9 +1127,8 @@ directly. This function sets, or adds to, the ``Vary header``. For example::
 its first argument and a list/tuple of case-insensitive header names as its
 second argument.
 
-For more on Vary headers, see the `official Vary spec`_.
-
-.. _`official Vary spec`: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.44
+For more on Vary headers, see the :rfc:`official Vary spec
+<7231#section-7.1.4>`.
 
 Controlling cache: Using other headers
 ======================================
@@ -1211,7 +1210,8 @@ Here's a full list:
 * ``max_age=num_seconds``
 * ``s_maxage=num_seconds``
 
-For explanation of Cache-Control HTTP directives, see the `Cache-Control spec`_.
+For explanation of Cache-Control HTTP directives, see the :rfc:`Cache-Control
+spec <7234#section-5.2>`.
 
 (Note that the caching middleware already sets the cache header's max-age with
 the value of the :setting:`CACHE_MIDDLEWARE_SECONDS` setting. If you use a custom
@@ -1229,8 +1229,6 @@ Example::
     def myview(request):
         # ...
 
-.. _`Cache-Control spec`: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9
-
 Order of ``MIDDLEWARE_CLASSES``
 ===============================
 

docs/topics/conditional-view-processing.txt

@@ -25,10 +25,10 @@ Depending on the header, if the page has been modified or does not match the
 ``ETag`` sent by the client, a 412 status code (Precondition Failed) may be
 returned.
 
-.. _If-match: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.24
-.. _If-none-match: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26
-.. _If-modified-since: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25
-.. _If-unmodified-since: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.28
+.. _If-match: https://tools.ietf.org/html/rfc7232#section-3.1
+.. _If-none-match: https://tools.ietf.org/html/rfc7232#section-3.2
+.. _If-modified-since: https://tools.ietf.org/html/rfc7232#section-3.3
+.. _If-unmodified-since: https://tools.ietf.org/html/rfc7232#section-3.4
 
 When you need more fine-grained control you may use per-view conditional
 processing functions.
@@ -45,7 +45,7 @@ functions to provide an "early bailout" option for the view processing.
 Telling the client that the content has not been modified since the last
 request, perhaps.
 
-.. _ETag: http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.11
+.. _ETag: https://tools.ietf.org/html/rfc7232#section-2.3
 
 These two functions are passed as parameters the
 ``django.views.decorators.http.condition`` decorator. This decorator uses

docs/topics/testing/tools.txt

@@ -321,8 +321,8 @@ Use the ``django.test.Client`` class to make requests.
         ``Response`` object. Useful for simulating diagnostic probes.
 
         Unlike the other request methods, ``data`` is not provided as a keyword
-        parameter in order to comply with :rfc:`2616`, which mandates that
-        TRACE requests should not have an entity-body.
+        parameter in order to comply with :rfc:`7231#section-4.3.8`, which
+        mandates that TRACE requests must not have a body.
 
         The ``follow``, ``secure``, and ``extra`` arguments act the same as for
         :meth:`Client.get`.
@@ -484,8 +484,10 @@ Specifically, a ``Response`` object has the following attributes:
 
     .. attribute:: status_code
 
-        The HTTP status of the response, as an integer. See
-        :rfc:`2616#section-10` for a full list of HTTP status codes.
+        The HTTP status of the response, as an integer. For a full list
+        of defined codes, see the `IANA status code registry`_.
+
+        .. _IANA status code registry: https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
 
     .. attribute:: templates