Update whatsnew

Author: barneygale

Doc/whatsnew/3.14.rst

@@ -998,7 +998,24 @@ urllib
 * Upgrade HTTP digest authentication algorithm for :mod:`urllib.request` by
   supporting SHA-256 digest authentication as specified in :rfc:`7616`.
   (Contributed by Calvin Bui in :gh:`128193`.)
+* Improve support for ``file:`` URLs.
 
+  In :func:`urllib.request.url2pathname`:
+
+  - Discard URL authorities that resolve to ``localhost``.
+  - Raise :exc:`~urllib.error.URLError` if a URL authority doesn't resolve
+    to ``localhost``, except on Windows where we return a UNC path.
+
+  In :func:`urllib.request.pathname2url`:
+
+  - Include an empty URL authority when a path begins with a slash. For
+    example, the path ``/etc/hosts`` is converted to the URL ``///etc/hosts``.
+
+  On Windows, drive letters are no longer converted to uppercase, and ``:``
+  characters not following a drive letter no longer cause an :exc:`OSError`
+  exception to be raised.
+
+  (Contributed by Barney Gale in :gh:`125866`.)
 
 uuid
 ----