fix(server): add zstd HTTP compression with gzip fallback#27935
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Add zstd as the preferred compression encoding, falling back to gzip and deflate. Modern browsers (Chrome 123+, Firefox 126+, Safari 18+) automatically send zstd in Accept-Encoding. Zstd provides ~30-40% better compression than gzip at similar speeds. Uses Bun.zstdCompressSync which is available natively in Bun.
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Issue for this PR
Closes #27932
Type of change
What does this PR do?
Adds zstd as the preferred compression encoding in the HTTP compression middleware, falling back to gzip and deflate. Modern browsers (Chrome 123+, Firefox 126+, Safari 18+) automatically send
zstdinAccept-Encoding.Zstd provides ~30-40% better compression than gzip at similar CPU cost. Uses
Bun.zstdCompressSync()which is available natively in Bun.Changes:
"zstd"to theEncodingtype unionzstdbeforegzipinpickEncodingto prefer itBun.zstdCompressSync()call for zstd encodingAll existing guards (SSE exclusion, threshold, no-transform, etc.) apply to zstd as well.
How did you verify your code works?
Tested locally by sending requests with
Accept-Encoding: zstd, gzipand verifying the response usesContent-Encoding: zstd. Verified fallback to gzip when zstd is not in Accept-Encoding.Screenshots / recordings
N/A — network-level improvement.
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