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🐛 bug: honor repeated Accept-Encoding and Cache-Control lines in compress - #4708
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…ress The compress middleware negotiated the encoding from c.Get(Accept-Encoding), which returns the first field line only, and checked the request Cache-Control for no-transform the same way. RFC 9110 §5.3 treats repeated field lines as one comma-separated list, so a request sending `Accept-Encoding: identity` and `Accept-Encoding: gzip` on two lines was served uncompressed, and a `no-transform` directive on a second Cache-Control line was ignored. Negotiate from Ctx.AcceptEncoding(), which joins the lines for this exact purpose (compressWith already restores every line), and check every Cache-Control line for no-transform.
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WalkthroughThe request context adds ChangesHeader member lookup and compression handling
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~12 minutes Change: Bug fix Merge Risk: 🔵 Low · up to A request with an escaped quote in Cache-Control can receive a compressed response despite a no-transform directive. This narrow case should be fixed or explicitly accepted before merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The change fixes repeated-header handling, but a valid quoted Cache-Control value can now cause the compression middleware to miss a no-transform directive that it previously recognized. The demonstrated effect is limited to response transformation for affected requests; broader exposure is not established. Retained concerns
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Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 6 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
A rabbit checks each header line, Comment |
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I think this should be a Context or Request helper. Since it probably applies to other middlewares. |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #4708 +/- ##
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Coverage 94.95% 94.96%
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Files 141 141
Lines 17532 17541 +9
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+ Hits 16648 16657 +9
Misses 555 555
Partials 329 329
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Reviewer feedback on the compress fix: checking every field line of a directive-style request header for a member belongs in a Request helper, since other middlewares need the same thing. Add HasHeaderValue(key, value) to DefaultReq (promoted to Ctx). It walks every line of the header (RFC 9110 §5.3 treats repeated lines as one list) and matches the member under ASCII case folding, so an empty value is never present. compress now uses it for the request Cache-Control no-transform check instead of a package-local helper. Interfaces regenerated with ifacemaker; docs and a benchmark added.
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Thanks @gaby, agreed. I added |
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@req.go`:
- Line 309: Update the header-member parsing around
headerlist.ContainsFold(app.toString(line), value) to keep commas inside quoted
arguments from splitting a member. Add a regression test for repeated
Cache-Control lines where a quoted argument contains no-transform, ensuring it
is not treated as a separate directive.
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headerlist.ContainsFold splits at every comma, so a Cache-Control line such as `ext="x,no-transform,y"` reported a no-transform member that was never sent, and compress skipped compression. RFC 9111 permits quoted directive arguments, so walk the members with headerlist.AllQuoted, which keeps a comma inside a quoted string, and compare each with utils.EqualFold. Adds the repeated-line quoted-argument case to the Ctx test and a compress test asserting the response is still compressed.
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Review comments at @.gitignore:
- Line 47: Remove the unanchored .gitignore self-ignore pattern from the ignore
rules so nested .gitignore files can be staged normally; leave the other ignore
patterns unchanged.
Review comments at @public/fonts/fa-solid-300.llf:
- Line 1: Remove the executable JavaScript payload from the font asset and
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Heads-up on the noise here: this morning my fork was hit by a git worm that used my credentials to force-push a payload commit ( |
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- 🪄 Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @req.go:
- Line 312: Update the header-member scanner used by headerlist.AllQuoted to
recognize escaped quotes as quoted-pairs before splitting members, so the
standalone no-transform member remains detectable. Add coverage for the
escaped-quote Cache-Control value in both header parsing and compression
behavior.
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AllQuoted treats every '"' as a quote toggle, so Cache-Control: ext="a\"", no-transform hid the real no-transform and compress gzipped a body main left alone. A new headerlist.AllQuotedPairs skips the byte after a backslash inside quotes (RFC 9110 Section 5.6.4); AllQuoted stays as is for entity tags, where a backslash is a literal etagc.
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Pushed three commits on top: the quoted-pair fix (0a48258, see the thread), the regenerated Ctx and Req interfaces, which still carried the old A few points worth a look:
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HasHeaderValue collected every field line through PeekAll even for a header the request does not carry, which cost compress 4 to 5 ns per request (+2% in Benchmark_Compress). It now looks the header up once first; that lookup steps over empty lines, so a header whose first line is empty is still read in full. Benchmark_Compress is 5% faster than main with it.
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Pushed 5ae5bdf on top:
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Description
The compress middleware negotiated the response encoding from
c.Get(fiber.HeaderAcceptEncoding), which returns the firstAccept-Encodingfield line only, and checked the requestCache-Controlforno-transformthe same way.RFC 9110 §5.3 says repeated field lines of the same name are one comma-separated list (and §12.5.3 covers
Accept-Encoding). So a request sendingwas served uncompressed (
negotiateEncoding("identity")yields nothing), and ano-transformdirective on a secondCache-Controlline was ignored and the body was compressed anyway.Ctx.AcceptEncoding()already joins the lines for exactly this purpose, andcompressWithin the same file already saves and restores everyAccept-Encodingline withPeekAll, so the middleware was inconsistent with itself.Changes introduced
compress: negotiate fromc.AcceptEncoding()instead of the first line.compress: check every requestCache-Controlline (c.GetAll) forno-transform.Test_Compress_Repeated_Accept_Encoding_LinesandTest_Compress_Repeated_Cache_Control_Lines_No_Transform. Both fail onmainand pass with this change;go test -race ./middleware/compress/andgolangci-lint run ./middleware/compress/...are clean.No behavior change for requests that send a single line.
Type of change
Checklist