gh-144212: Add image/jxl to mimetypes (GH-144213)

Author: FooIbar

Doc/whatsnew/3.15.rst

@@ -606,6 +606,7 @@ mimetypes
 * Add ``application/dicom`` MIME type for ``.dcm`` extension. (Contributed by Benedikt Johannes in :gh:`144217`.)
 * Add ``application/node`` MIME type for ``.cjs`` extension. (Contributed by John Franey in :gh:`140937`.)
 * Add ``application/toml``. (Contributed by Gil Forcada in :gh:`139959`.)
+* Add ``image/jxl``. (Contributed by Foolbar in :gh:`144213`.)
 * Rename ``application/x-texinfo`` to ``application/texinfo``.
   (Contributed by Charlie Lin in :gh:`140165`.)
 * Changed the MIME type for ``.ai`` files to ``application/pdf``.

Lib/mimetypes.py

@@ -609,6 +609,7 @@ def _default_mime_types():
         '.jpeg'   : 'image/jpeg',
         '.jpm'    : 'image/jpm',
         '.jpx'    : 'image/jpx',
+        '.jxl'    : 'image/jxl',
         '.heic'   : 'image/heic',
         '.heif'   : 'image/heif',
         '.png'    : 'image/png',

Lib/test/test_mimetypes.py

@@ -271,6 +271,7 @@ def check_extensions():
                 ("image/jp2", ".jp2"),
                 ("image/jpeg", ".jpg"),
                 ("image/jpm", ".jpm"),
+                ("image/jxl", ".jxl"),
                 ("image/t38", ".t38"),
                 ("image/tiff", ".tiff"),
                 ("image/tiff-fx", ".tfx"),

Misc/NEWS.d/next/Library/2026-01-24-23-11-17.gh-issue-144212.IXqVL8.rst

@@ -0,0 +1 @@
+Mime type ``image/jxl`` is now supported by :mod:`mimetypes`.