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Add JXL MIME and skip compression for .jxl and .avif#674

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chicheng wants to merge 2 commits intoevansd:mainfrom
chicheng:feature/jxl
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Add JXL MIME and skip compression for .jxl and .avif#674
chicheng wants to merge 2 commits intoevansd:mainfrom
chicheng:feature/jxl

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@chicheng
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Chrome and Firefox are very likely to support JXL next year thanks to PDF adopts JXL as HDR image format.

Copilot AI review requested due to automatic review settings November 24, 2025 07:54
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Pull request overview

This PR adds support for JPEG XL (JXL) image format by adding its MIME type mapping and ensuring both JXL and AVIF files skip compression, while also updating the minimum supported Python version from 3.9 to 3.10.

  • Added MIME type mapping for .jxl files to image/jxl
  • Updated compression skip list to include jxl and avif extensions
  • Updated documentation to reflect Python 3.10 as the minimum supported version

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file
File Description
src/whitenoise/media_types.py Added .jxl to image/jxl MIME type mapping in alphabetically sorted list
src/whitenoise/compress.py Added jxl and avif to SKIP_COMPRESS_EXTENSIONS to avoid compressing already-compressed image formats
scripts/generate_default_media_types.py Added .jxl override to EXTRA_MIMETYPES dictionary for media type generation
docs/index.rst Updated minimum Python version requirement from 3.8 to 3.10
docs/changelog.rst Added changelog entry for dropping Python 3.9 support and skipping compression for AVIF/JXL files

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@Archmonger Archmonger mentioned this pull request Mar 7, 2026
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2 participants