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[kTrailers] takes the text of Node v26.10.0 (nodejs/node#65863). A throw from sendTrailers() no longer leaves the native callback, and a false answer is no longer dropped: both destroy the stream, so closed rejects and the response ends.
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Status of this PR. How it was reproduced, on a release build of main (c814409) and on a debug build of main (5900354):
Two of the three new tests in CI passed on e7121bd (build #128459). The four review threads are resolved. The PR waits for a maintainer's review. |
WalkthroughWhen sending pending QUIC trailers, the stream is now destroyed if sending throws or returns false. Tests cover invalid trailers, stream close errors, and client response body behavior. ChangesPending QUIC trailers
Suggested reviewers: Priority: ➖ Normal Merge Risk: 🔵 Low · up to
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| Title check | |
The title clearly and concisely describes the primary change: destroying the stream when pending trailers cannot be sent. |
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The description explains the problem, fix, scope, limitations, and verification results. It does not use the template headings exactly, but it provides the required information through the Problem, Fi… |
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The description explains the problem, fix, scope, limitations, and verification results. It does not use the template headings exactly, but it provides the required information through the Problem, Fix, and Tests sections.
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Inline comments:
Review comments at @test/js/node/quic/quic-stream.test.ts:
- Around line 392-393: In the test’s response-body handling, await the promise
chain so the client body read settles before asserting response.closed. Update
the response.body.catch call in the test; keep its rejection handling and the
existing assertion unchanged.
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src/js/internal/quic/quic.tstest/js/node/quic/quic-stream.test.ts
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline findings, I also checked the sibling onwanttrailers branch in [kTrailers] (it already runs through safeCallbackInvoke, which destroys the stream on a throw, so the new try/catch brings the pendingTrailers branch to the same contract) and the test's ordering assumption (the server's trailer attempt fires from onStreamTrailers when the body is flushed, before the second request's headers are answered, so reading closed after that answer is not a race).
Extended reasoning...
The change wraps the single pendingTrailers send in src/js/internal/quic/quic.ts:2611-2624 so that a thrown validation error or a false native result destroys the stream, matching the cited Node v26.10.0 lines, and adds two failure-path tests in test/js/node/quic/quic-stream.test.ts. It touches no auth, crypto or input-parsing surface; the error goes through the existing ERR_QUIC_STREAM_ABORTED wrapper over $ERR_QUIC_STREAM_ABORTED. The inline findings about client-visible wire behavior and the missing success-path test are what a human should weigh, so this is a ruled-out note rather than an approval.
A new test sets a valid pendingTrailers block. It checks that the client gets the trailers and the body, and that the server stream closes with no error. The test for a block that the native side refuses now waits for the client's read to end. The helper no longer fails when that read ends with an error, because the native side decides how it ends.
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Updated 2:44 PM PT - Oct 18th, 2026
✅ @robobun, your commit e7121bd3b1d155a74a6fb05e4c6973c5c72cb6f9 passed in 🧪 To try this PR locally: bunx bun-pr 45941That installs a local version of the PR into your bun-45941 --bun |
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
The new success-path test for a valid pendingTrailers block addresses the gap I noted on the previous push. Beyond the inline finding, I also checked that this.destroy(error) inside the new catch cannot itself throw back out of the native onStreamTrailers callback — destroy() only throws while validating options, which [kTrailers] never passes, and it is a no-op if the stream is already destroying.
Extended reasoning...
The diff changes only the pendingTrailers branch of QuicStream[kTrailers] in src/js/internal/quic/quic.ts (try/catch around sendTrailers, destroy on throw or falsy result, clear pendingTrailers only on success) and adds three tests in test/js/node/quic/quic-stream.test.ts; no security-sensitive surface is touched. The runtime change is small and mirrors the cited Node v26.10.0 control flow, but the inline finding about the setBody path never reaching this branch is pre-existing and worth a maintainer's call on scope.
Problem
sendTrailers()throws for apendingTrailersblock, the throw leaves the native callback: uncaughtTypeError: HTTP/1 Connection specific headers are forbidden: "connection"atonStreamTrailers. The response never ends.sendTrailers()answersfalse.[kTrailers](src/js/internal/quic/quic.ts:2611) drops the answer: no trailers, no end of stream, no error.Fix
[kTrailers]takes Node v26.10.0's text (nodejs/node#65863). A throw destroys the stream with the error, afalsewithERR_QUIC_STREAM_ABORTED.stream.closedreports the failure.test/js/node/quic/quic-stream.test.ts(the 2 for a refused block fail on main),test/js/node/quic/and the 235 vendoredtest-quic-*files.Background
onStreamTrailers) when the body is written.sendTrailers()throws whenbuildNgHeaderStringrefuses the block (aconnectionfield). It answersfalsewhen the native side does (U+0100 in a value).quic.tsports Node v26.3.0. This hunk is from v26.10.0.Downsides
writerresponse reads the body and a FIN, with no error.destroy()does this on purpose (node:quic on lsquic — Node v26 compat, HTTP/3 #32602).pendingTrailersis dropped silently, and Node sends it.pendingTrailersruns 3 more bytecode instructions (18 to 21). Builtins grow by 251 bytes,.textby 0.Notes
Origin. Found by a read of the code. No user reported it.
Real Node. No official Node build ships
node:quic, so no reviewer can download a binary that runs these. The Node rows come from each release's ownlib/internal/quicandsrc/quic, built out of tree against the official binary. The server setspendingTrailers, writesbodyand ends.onwanttrailersis set.pendingTrailersstream.closed{ connection: "close" }ERR_HTTP2_INVALID_CONNECTION_HEADERSERR_HTTP2_INVALID_CONNECTION_HEADERSTypeErrorERR_HTTP2_INVALID_CONNECTION_HEADERSbody, stream ends{ "x-bad": "a\u0100b" }body, stream endsERR_QUIC_STREAM_ABORTEDbody, stream endsWith a body from
setBody([chunk]), this PR gives the same two rejections on the server. The client readsbodyand then getsERR_QUIC_STREAM_RESET.Not in this PR. Two more places send a header block for the caller. Both are left as they are, on purpose.
create*Stream({ headers }): a refused block rejects the create and leaves the opened stream behind. Node v26.10.0 does the same, because#createStreamopens the stream before it checks its options. A change there movesquic.tsaway from Node, and changes of that kind were declined as bug-for-bug in the review of node:quic on lsquic — Node v26 compat, HTTP/3 #32602 (1, 2). It needs a maintainer's decision first.bind_raw). node:quic: reset the stream when lsquic_stream_write fails instead of retrying on every tick #42892 works on the native refusal path, and a second PR on the same functions would collide with it.robobun/c5650134/quic-open-stream-header-block. It is not opened as a PR.Tests. The describe
pendingTrailershas three tests. The first sets a valid block. The client gets the trailers and the body, and the server stream'sclosedresolves. It passes on main too. The other two wait for the answer to a later request before they read the server stream'sclosedstate. The server asks a stream for its trailers when the body leaves, which is before it gets that request. On main the test for a throw fails with the uncaughtTypeError, the test forfalsewith"open"in place of"ERR_QUIC_STREAM_ABORTED". The test for a throw requires that the client readsbodyto a normal end. The test forfalsewaits for the client's read to end and does not pin how, because #42892 makes the native side reset such a stream.FIN after the destroy.
QuicStream::destroy(src/runtime/node/quic/stream.rs) ends a response that the stream wrote and ended: it drops the owed trailers and closes the stream, which sends FIN. The first test inquic-stream.test.ts(from #32602) requires this for the other branch of[kTrailers], whereonwanttrailersthrows. That branch leaves the same state as apendingTrailersblock that cannot be sent. With a reset in place of the FIN, the client readsbodyand then its read rejects withERR_QUIC_STREAM_RESET(tried on loopback, not in this PR).Bodies that never ask for trailers. A
writerbody and a body fromsetBody([chunk])end throughend_write, which asks the stream for its trailers. A buffer or a string passed tosetBody(), and a buffer passed asbodytocreate*Stream(), end with FIN:attach_source(src/runtime/node/quic/stream.rs) andopen_stream(src/runtime/node/quic/session.rs) setPendingEnd::Finand do not readwants_trailers. For these bodiesonwanttrailersis not called andpendingTrailersis not sent, valid or not, with no error. That is so on main and with this PR. Node v26.3.0 and v26.10.0 send the trailers for each of these bodies. This PR does not change it, because the cause is native and separate from a refused block.Measurements. Release builds of main c814409 with and without the hunk: stripped
bun106,850,016 bytes on both,.text81,315,157 on both,.bun_builtins2,689,491 to 2,689,742.[kTrailers]bytecode: 33 to 52 instructions in total, 18 to 21 on the path that sends the trailers, 24 on both for theonwanttrailerspath.Suites.
quic-stream.test.ts: 11 runs on the debug build and 30 runs on a release build of main with this hunk, 0 failures.quic-endpoint.test.ts,quic-sni.test.ts. Vendoredtest-quic-*: 233 of 235 pass on the debug build. The other two,test-quic-session-initial-rttandtest-quic-callback-error-onstream, use no trailers and depend on timing (the first asserts an RTT under 10 ms). Both pass 20 of 20 on release builds of main and of main with this hunk.