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Status Reproduced on main and on 1.4.3-canary with a raw The same early 'timeout' reproduces for a chunk size line with an extension, a trailer section, the head of the next request on a kept-alive connection, a request body that nothing reads, and over TLS. Each one is a test in |
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Included review availability: Your plan provides up to 10 included reviews per hour; 0 remain after this review. WalkthroughThe change tracks whether native reads deliver data to JavaScript, forwards no-data socket activity to Node HTTP timeout handling, refreshes existing keep-alive timers, and adds fragmented HTTP and HTTPS timeout tests. ChangesNode HTTP timeout activity
Suggested reviewers: Priority: ➖ Normal Merge Risk: ⚪ Minimal · up to Fragmented Node HTTP input now refreshes inactivity timers, preventing premature request loss for slow HTTP and HTTPS clients; no merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@src/js/node/_http_server.ts`:
- Line 1474: In the timeout handling flow, store socket.timeout once in a local
timeout variable before the condition, then use that variable for both the
sinceLastRead comparison and socket.setTimeout() call.
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packages/bun-uws/src/HttpContext.hpackages/bun-uws/src/HttpResponseData.hsrc/js/node/_http_server.tssrc/jsc/bindings/node/JSNodeHTTPServerSocket.cppsrc/jsc/bindings/node/JSNodeHTTPServerSocket.hsrc/jsc/bindings/node/JSNodeHTTPServerSocketPrototype.cpptest/js/node/http/node-http-server-timeouts.test.ts
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Jarred-Sumner
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too much overhead.
…eout The uWS parser keeps an unfinished request head, chunk framing and trailers to itself, so no JS callback refreshed the socket timer for those bytes. server.timeout and keepAliveTimeout fired while the client was still sending. uWS now records the time of every read on a node:http connection. When the timer expires, it asks the handle how long ago the last read was and re-arms itself to that read plus the timeout.
…ests a longer timeout
…ng, without timestamps uWS marks a read that dispatched a request or delivered body bytes. For any other read it tells the JS socket, which calls _unrefTimer() like Node does on every socket read. The read timestamp, msSinceLastRead() and the check at timer expiry are gone. The keep-alive timer keeps its full interval when it grants the rest of an idle period, so a later refresh() cannot reuse a shorter one.
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robobun
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Reworked in 9339b82 and 86bb758. There are no timestamps now.
One JS change remains in |
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Updated 11:08 PM PT - Sep 21st, 2026
❌ @robobun, your commit 86bb758 has 1 failures in
🧪 To try this PR locally: bunx bun-pr 43744That installs a local version of the PR into your bun-43744 --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.
Additional findings (outside the current diff — GitHub can't attach inline comments there):
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src/js/node/_http_server.ts— A server configured with server.timeout equal to keepAliveTimeout + keepAliveTimeoutBuffer and a 'timeout' listener that keeps the socket alive ends up with idle keep-alive connections that never close. After the server.timeout timer fires during a request, onSocketTimeoutTimerExpired at _http_server.ts:1470 leaves the fired timer in the slot because kKeepAliveTimeoutSet is false. On response finish, _http_server.ts:2450 sees timer._idleTimeout === total and only sets socket.timeout, never refreshing the dead timer, so the idle period has no live deadline. Fix: the fast path must check the timer is still armed (or refresh it) before trusting it, for both the equal-interval and setTimeout branches.Why this was flagged
Trigger: server.timeout = 6000, keepAliveTimeout = 5000 (default buffer 1000, total 6000), plus a 'timeout' listener that does not destroy the socket (a common pattern to log and let the request finish). A slow request lets the server.timeout timer fire mid-request; onSocketTimeoutTimerExpired at _http_server.ts:1453 skips the keep-alive branch, the guard at :1470 is false so the slot keeps the fired timer, and _onTimeout emits 'timeout'. The response then finishes and onResponseFinishHandleSocket at :2449-2456 takes the fast path: timer._idleTimeout === 6000, so socket.timeout is assigned and kKeepAliveIdleStart/kKeepAliveTimeoutSet are set with no refresh. The dead timer never fires again, so the kept-alive connection is never closed for idleness. With this PR, only a read that delivers nothing to JS (HttpContext.h:733 -> _unrefTimer at :1732) can revive it; a peer that simply goes silent never triggers that. The base branch has the same fast path, so the dismissal is right that it is pre-existing, but this PR rewrote the expiry function that owns the slot and left the revival…
Verification: pre-existing. Triggering condition: server.timeout equals keepAliveTimeout + keepAliveTimeoutBuffer (e.g. 6000 = 5000 + default 1000, /home/claude/bun/src/js/node/_http_server.ts:2437 defaults the buffer to 1000), a request whose handler is slow enough for server.timeout to fire before the response ends, and a 'timeout' listener that returns without destroying the socket. Mechanism, verified in…
…ve deadline with a test The activity hook now calls _unrefTimer() synchronously at the end of the read. A posted task ran after the timers of the same loop iteration, so a read just before the deadline could still lose to the timer.
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I re-reviewed the latest push (86bb758) and found no new bugs; it addresses the ordering, close-wiring and keep-alive-deadline points from the earlier pass, but a maintainer look is still worthwhile since the refresh now runs JS synchronously from inside uWS's read handler and an earlier changes-requested review is still open.
What was reviewed:
HttpContext::onDatatail:readDeliveredis exchanged before uncork/shouldCloseConnection, and the hook runs last behind!us_socket_is_closed(s)and a non-nullsocketData; nothing touches the socket after it beforereturn returnedData, so a synchronous close from JS cannot be followed by a stale use in this frame.JSNodeHTTPServerSocket::onActivity:duplex->getis under a top exception scope with the exception reported, and_unrefTimergoes throughrun_callback(enter/exit + exception reporting);_unrefTimeritself only doestimer?.refresh(), so no user 'timeout' listener runs from the read path.onSocketTimeoutTimerExpired:refresh()then_idleStart -= idleForkeeps the full interval and preserves the old deadline; the new fake-timer test now fails if that clause is dropped.sendSlowly: client 'close' now settles the awaited promise, so a connection dropped without 'timeout' fails fast instead of hanging.
Extended reasoning...
The change spans the vendored uWS HTTP layer (a per-response readDelivered flag and a new onSocketActivity hook), the C++ node:http socket handle (a synchronous call into the JS duplex's _unrefTimer), the _http_server.ts keep-alive timer expiry path, and 8 new tests in node-http-server-timeouts.test.ts. It touches no auth, crypto or injection surface, but it runs JS from inside the native read handler on every undelivered read, which is a hot-path and re-entrancy design choice a maintainer should weigh (the PR itself notes a byte-by-byte client now costs one JS call per byte). The timeline shows a CHANGES_REQUESTED review from a maintainer with later commits but no recorded dismissal, and the bug hunt ran dry without findings, so defer rather than approve.
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Problem
server.timeout,keepAliveTimeout) fires while the client still sends. Withserver.timeout = 300, a head sent in 40-byte pieces every 120 ms gets 'timeout' at 302 ms. Node answers at 846 ms._unrefTimer(),src/js/node/_http_server.ts). None runs for bytes the native layer keeps: an unfinished head, a chunk size line, trailers, an unread body. Node refreshes on every socket read.Fix
readDeliveredinHttpContext::onData). Any other node:http read calls the newonSocketActivityhook._unrefTimer(), as Node does on every read. No timestamps. A read that JS sees costs one byte store._idleStartback. It armed a shorter timer before, and a laterrefresh()reused that interval.test/js/node/http/node-http-server-timeouts.test.ts(9 new tests, 8 fail without the fix),node-http.test.ts, 72 upstreamtest-http-*tests.Background
NodeHTTPServerSocket.setTimeoutarms one unref'd JS timer per connection.server.timeout,keepAliveTimeout,req.setTimeoutuse it._idleStart(timers: reschedule timer when _idleStart is written #36859).Downsides
headersTimeoutorrequestTimeoutends it, as in Node.server.timeoutclosed it before.Notes
Repro
A raw
netclient againsthttp.createServerwithserver.timeout = 300,keepAliveTimeout = 300,keepAliveTimeoutBuffer = 0. The client writes a 270-byte request head in 40-byte pieces, one every 120 ms, then an 800-byte body.The control (head in one write, body in 100-byte pieces every 120 ms) completes on every build, because body chunks reach JS.
The same gap, six shapes
Each one gets an early 'timeout' on 1.4.3-canary and matches Node on this branch. Each one is a test.
server.timeoutserver.timeoutserver.timeoutserver.timeoutkeepAliveTimeoutkeepAliveTimeoutA client that goes silent after a partial head gets 'timeout' one timeout after its last piece (314 ms on the loaded debug build, 301 ms on Node). On 1.4.3-canary the timeout runs from the accept.
A 'timeout' listener that keeps the socket now also matches Node. The client pauses for one 'timeout', sends three more head bytes, and goes silent. Node emits 'timeout' at
[301, 952]ms, 1.4.3-canary at[303]only, this branch at[429, 992]on the debug build.refresh()arms a timer that already fired, asnet.Socketdoes.How a read counts as delivered
The request handler lambda sets
readDeliverednext toheadersCompleted. The data handler lambda sets it before it hands bytes toinStream(a request body) or toonSocketData(a CONNECT or Upgrade tunnel). JS refreshes the timer itself on those paths (onNodeHTTPRequest,onDataIncomingMessage, the tunnel's#onData). The end ofonDataexchanges the flag withfalse. If it was not set, the read produced no callback, and the hook fires. After an earlyres.end()the response clearsinStream, so the rest of the upload counts as not delivered.Cost on the paths that every request takes: one byte store per dispatched request, one per delivered body chunk, one byte exchange per read. No clock read, no JS call, nothing per connection.
The hook runs at the very end of
onData, behind a closed-socket check, and calls_unrefTimer()synchronously throughBun__EventLoop__runCallback2. A posted task was the first shape. The loop runs I/O, then timers, then tasks, so a read that arrived just before the deadline still lost to the timer in the same iteration.Why the keep-alive timer changed
onResponseFinishHandleSocketleaves the keep-alive timer armed across requests and records when the idle period started. When the timer fires before that period is over,onSocketTimeoutTimerExpiredgrants the rest. It did that with a new, shorter timer. With a refresh on every read, a head byte that arrives in that window refreshed the short timer with its short interval, and 'timeout' came early again. The timer now stays at its full interval:refresh(), then_idleStart -= idleFor. The deadline is the same as before, and no timer is allocated.Two tests use fake timers, so the order is exact. In both, the keep-alive timer fires at 1000 with 500 ms of the idle period left. In the first, an unfinished head arrives, 700 ms pass, and the request completes. With the old block and the new hook, that test gets 'timeout' at 1500. In the second, the connection stays silent, and 'timeout' must come between 1400 and 1600. That one passes on main too. It fails if the
_idleStartline is removed.The first version of this PR
The first version recorded a timestamp on every read and compared it with the timeout when the timer expired. The review called that too much overhead. This version has no timestamps, no work at timer expiry, and no fake timers special case.
Test stability
The clients write 14 pieces 100 ms apart against a 1000 ms timeout. A first version with 500 ms and 50 ms failed 1 of 4 runs at three times CPU oversubscription: a stalled event loop runs the server's timer before it reads the bytes that wait in the socket, which is a real inactivity timeout. The TLS case does not run beside the others. 12 of 12 runs passed under the same load.
Not in this PR
res.write()does not refresh the timer either: a response that writes every 120 ms gets 'timeout' at 302 ms withserver.timeout = 300. Node finishes that response. This is a different cause (response writes do not go through the socket's_write) and is tracked as separate work.Suites run on the debug build
node-http-server-timeouts.test.ts(19 pass),node-http.test.ts(163 pass, 1 skip),node-http-res-settimeout-unref,node-http-req-socket-pause,node-http-server-abort-events,node-http-connect,node-http-transfer-encoding,node-http-backpressure, 72 upstreamtest-http-*andtest-https-*files on keep-alive, timeouts, pipelining, chunked bodies and header limits,bun run lint, andtsc -p src/js/tsconfig.json.[human-review] gate passed · iteration 0 · 9 files touched
fails on main (without fix)
passes on PR (with fix)
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gate history · 2 passed · 0 rejected · iteration 0
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