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Updated 6:27 AM PT - Oct 22nd, 2026
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughFile response streams no longer receive the server idle timeout or reset the response timeout while reading or resuming writes. Tests cover request timeout overrides for stalled file responses over TCP, TLS, and HTTP/2. ChangesFile response timeout handling
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Actionable comments posted: 2
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Inline comments:
Review comments at @test/js/bun/http/bun-serve-file.test.ts:
- Line 2045: Remove the explicit 30_000 timeout arguments from both affected
test declarations, including the corresponding test that uses 30000, and leave
Bun to enforce the test timeouts.
Review comments at @test/js/bun/http/serve-http2-lifecycle.test.ts:
- Around line 261-287: Remove the explicit 30000 timeout argument from the test
callback containing the “server.timeout(req, 0) holds for a Bun.file body” case,
leaving the test to use Bun’s default timeout.
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📒 Files selected for processing: 9
src/runtime/server/DirectoryRoute.rssrc/runtime/server/FileResponseStream.rssrc/runtime/server/FileRoute.rssrc/runtime/server/RequestContext.rssrc/runtime/server/StaticRoute.rssrc/uws_sys/Response.rstest/js/bun/http/bun-serve-file.test.tstest/js/bun/http/serve-http2-fixture.tstest/js/bun/http/serve-http2-lifecycle.test.ts
💤 Files with no reviewable changes: 4
- src/runtime/server/DirectoryRoute.rs
- src/runtime/server/StaticRoute.rs
- src/runtime/server/FileRoute.rs
- src/runtime/server/RequestContext.rs
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Beyond the inline findings, I also checked the deleted StaticRoute::on_writable re-arm: StaticRoute::on (src/runtime/server/StaticRoute.rs:323) already stores server.config().idle_timeout on the response before the body streams and no handler runs in between, so the removed per-writable timeout() only ever rewrote the same value and try_end re-arms the timer after each writable event.
Extended reasoning...
The change removes the per-chunk and per-writable resp.timeout(idleTimeout) stores from FileResponseStream and StaticRoute and replaces the start-of-stream store with reset_timeout(), so a handler's server.timeout(req, n) survives into a Bun.file body. It touches no security-sensitive surface. The inline findings (WebSocket-upgrade fetch entry never storing a budget, server.timeout(req, 0) outliving the response on keep-alive, the H3 no-op, and two test-reliability issues) are what keep this from an approve; the StaticRoute deletion was independently checked and is behavior-preserving.
Findings marked 🟡 are optional suggestions and need no follow-up push.
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FileResponseStream kept a copy of the server's idleTimeout and stored it on the response at start, on each chunk and on each writable event. That replaced the value a handler set with server.timeout(req, n), so a Bun.file body ran under the server-wide value. The stream now arms the timer once at start with the value the response already holds, and makes no other timer call. uWS arms the timer on each write, end and writable event. StaticRoute::on_writable made the same store and loses it too.
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Part of #44732: its file-body fix, which needs no decision.
Problem
server.timeout(req, n)in a handler is lost when the Response body is aBun.file. The body runs underidleTimeout(since 1.3.13, serve: consolidate file streaming into FileResponseStream; Range support; fix aborted-stream hang #29202).FileResponseStreamcalledresp.timeout(idleTimeout)at start, per chunk and per writable event (src/runtime/server/FileResponseStream.rs:192,:316,:393). That call stores over the handler's value.Fix
resp.reset_timeout()). Its other timer calls, itsidleTimeoutcopy and the same store inStaticRoute::on_writableare deleted.test/js/bun/http/bun-serve-file.test.ts(4 new tests, plain TCP and TLS) andserve-http2-lifecycle.test.ts(1). All 5 fail on main.Background
resp.timeout(n)stores the idle budget of one response and arms the socket timer.resp.reset_timeout()only arms it.reset_timeout()at all three calls, as in Bun.serve: end a server.timeout(req, N) override with its response #44732: it keeps an arm per chunk that uWS repeats.Downsides
server.timeout(req, 0)now stays on the kept HTTP/1 connection after aBun.fileresponse, as after every other body: open at 17 s, before closed at 4.5 s.Sec-WebSocket-Keythatfetchanswers with a quietBun.filebody now closes at 13 s underidleTimeout: 60, as every other body there.server.timeout(req, 1)now ends aBun.filedownload that still moves at the next sweep, like a Blob body.Notes
History
Bun.fileresponses ignoreserver.timeout()").reset_timeout(). It is part of a change of the override's lifetime, which waits for a maintainer's decision. This PR deletes two of those three calls. Bun.serve: end a server.timeout(req, N) override with its response #44732 needs a rebase on top of it.sendfile(2)it holds on main.server.timeout()before and after (Bun.serve: apply server.timeout() on a unix socket server #45360).The report's script
It starts two servers (
idleTimeout4 and 0) with a 48 MiB body. A raw client reads nothing for 14 s, then reads to the end.idleTimeout4,Bun.file, no pauseidleTimeout4,Bun.file, no callnoCallidleTimeout4,Uint8Array, n = 120idleTimeout0,Uint8Array, n = 4idleTimeout4,Bun.file, n = 120call30idleTimeout4,Bun.file, n = 0call0idleTimeout0,Bun.file, n = 4callThe same shape over TLS (
idleTimeout1 and 0, n = 0 and 1): 2 of 5 cells wrong on main, 0 of 5 here.Script (exit 1 on main, exit 0 here)
Why each deletion is safe
FileResponseStream::startstores the value first: the request entry (mod.rs:799,server_body.rs:2747),FileRoute::onandDirectoryRoute::on. The copy was the same value, or a stale one afterserver.timeout().resp.write()orresp.end(). Both arm the timer in uWS (HttpResponse.h:303,:343,:850). The reader never delivers an empty chunk.HttpContext::onWritable, which disarms the timer before the callback and arms it after (HttpContext.h:936,:1016).StaticRoute::on_writablecallstry_endnext, which arms the timer. Its store always wrote the value thatStaticRoute::onstored.HttpContext.h:679), andsendfile(2)passes no uWS write. Without it, a POST that is answered with a large file is never timed out for a client that reads nothing.Measurements (Linux x64, main 7f3bc6a against this PR)
Timer calls by the file stream per response (gdb hit counters on the uWS C shims, debug builds, 20 GETs each,
idleTimeout: 30, noserver.timeoutcall). On main each call stores and arms. Here the one call only arms.Executed instructions per call (gdb
stepi, release builds, callee only). Per chunk and per writable event: 22 to 0 on HTTP/1, 49 to 0 on HTTP/2 with one open stream. The call at start: 22 to 21 on HTTP/1, 49 to 26 on HTTP/2.Release
.text: 106,511,844 to 106,511,076 bytes (-768).dataandbssdo not change.Socket timer state after each file-stream write and at each return of
HttpContext::onWritableon this PR (gdb, debug build,idleTimeout: 8, slowcurl --limit-ratereaders): disarmed in 0 of 215 events. Runs: 8 and 32 MiB over TLS, 512 KiB over TCP, 8 and 32 MiB over TCP (sendfile). Also a 32 MiB static route over TCP and TLS.Behaviour that moves for a server that exists today (raw
node:netand raw HTTP/2 clients)idleTimeout: 4,server.timeout(req, 0), 1 KiBBun.file, then a silent kept connectionSec-WebSocket-Key,fetchanswers with a quietBun.file(fifo),idleTimeout60 / 0 / 10ReadableStreamidleTimeout: 0,server.timeout(req, 1), 256 MiBBun.file, client reads about 16 MiB/sBun.filewithserver.timeout(req, 5)idleTimeout: 8,Bun.file(fifo), stream window closed, first chunk at 5 son_web_socket_upgrade, the/*fallback) stores noidleTimeout, for any body kind. ABun.filebody got the server's value there only through the store that this PR removes. Bun.serve: end a server.timeout(req, N) override with its response #44732 makes every response start under the server's value, that entry included. node:http: apply the server's idleTimeout at accept so headersTimeout > ~13s is honored #35672 seeds the value only when a connection is accepted.What the tests pin
bun-serve-filetests are concurrent and take 4.5 to 6.5 s each on a debug build.connection closed before expected frame.afterRequestBodyleg readswhole.FileRoute::onorDirectoryRoute::onremoved,fileRouteordirRoutereadswhole.noCall,fileRoute,dirRouteandstaticRoutelegs pass on main too. They show thatidleTimeoutstill closes a body that stalls after writable events.shorter ntest has anoCallleg that expectswhole. UnderidleTimeout: 0nothing closes a stalled body without the call.SO_RCVBUF. Without that the stall depends on the host: Linux 6.16 and later let a receive buffer grow to 32 MiB. The tests pass in a network namespace with larger limits. Thetcp_rmemandtcp_wmemmaxima were 32 and 4 MiB, 32 and 16 MiB, 64 and 32 MiB.staticRouteleg is off for plain TCP on Windows, where Winsock takes the first send whole.cutlegs one more period, by its description. Whichever lands second adjusts them.bun-serve-static,serve-directory-routes,serve-direct-readable-stream,bun-server,serve-http2, andserve.test.ts. Inserve.test.tstwo tests fail here and on main in this container. One needs a non-root user. One runs 500 TLS requests under a 10 s limit.Rejected from the self-review
bun:internal-for-testing, so that the tests wait no wall time. Main has no such hook. usockets: store the socket timeout as a 32-bit due tick, sosocket.timeout()above 240 s fires #45614 and Bun.serve: end a server.timeout(req, N) override with its response #44732 each add one. A hook added here makes the test files fail to load on main, so the fail-before proof becomes an import error. The tests switch in one line each when a hook lands.Also in the diff
AnyResponse::timeoutandAnyResponse::reset_timeoutstate the rule: entries andserver.timeout()store, body writers only arm. Both are no-ops on HTTP/3, and the comments say so.server.upgrade(req)after a file response began (Bun.serve: server.upgrade() returns false once a response to the request has started #45376): the first use of the response inon_read_chunkis nowwriteorend, where it was the timer call.no test proof · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/bun/http/bun-serve-file.test.ts