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…closed socket When the socket is already gone, ServerResponse.end() set _header but not the header state, so headersSent said false while setHeader() threw ERR_HTTP_HEADERS_SENT. Node renders the head in end() unless write_() dropped the chunk of a destroyed response. Mirror that: set both, or neither. The closed branch of write() marks the head sent the same way.
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Updated 10:44 PM PT - Oct 16th, 2026
❌ @robobun, your commit 8ac5141 has 1 failures in 🧪 To try this PR locally: bunx bun-pr 45380That installs a local version of the PR into your bun-45380 --bun |
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughServerResponse now handles header state differently when writes or ends occur after a client disconnect. Tests cover header state and response completion around socket closure. ChangesHTTP disconnect header state
Suggested reviewers: Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
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| Linked Issues check |  |
Issue #44925 requires Node-compatible agreement between res.headersSent and _header after a client disconnect. The PR updates closed-socket handling in ServerResponse.end() and `ServerResponse.w… |
| Out of Scope Changes check | |
The source changes are limited to closed-socket handling in ServerResponse.end() and ServerResponse.write(). The added tests cover the linked issue's required Node-compatible cases. No unrelated c… |
| Title check | |
The title clearly and concisely identifies the main change: aligning headersSent and _header when a response ends on a closed socket. |
| Description check | |
The description explains the problem, implementation, expected behavior, testing performed, and known test timeout. It does not use the exact template headings, but it provides the required informatio… |
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#44925requires Node-compatible agreement betweenres.headersSentand_headerafter a client disconnect. The PR updates closed-socket handling inServerResponse.end()andServerResponse.write(). It preserves both states when Node renders the head and leaves them unset when Node drops the destroyed response chunk. Four tests cover the state and latesetHeader()behavior, including the Express failure path.
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The source changes are limited to closed-socket handling in
ServerResponse.end()andServerResponse.write(). The added tests cover the linked issue's required Node-compatible cases. No unrelated changes are shown.
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The description explains the problem, implementation, expected behavior, testing performed, and known test timeout. It does not use the exact template headings, but it provides the required information in equivalent sections.
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Review comments at @src/js/node/_http_server.ts:
- Line 3750: Update the closed-socket write branch that sets `headerStateSymbol`
to `NodeHTTPHeaderState.sent` so it also sets `_header` immediately, keeping
both observable header states consistent after `write()`. Add or update the test
to assert both values immediately after the write.
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src/js/node/_http_server.tstest/js/node/http/node-http-server-abort-events.test.ts
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…nside OutgoingMessage ServerResponse.end() cleared the chunk before it delegated to OutgoingMessage.end(), so that path rendered the head. Hand the original chunk over: write_() drops it for a destroyed message before _implicitHeader(), as in Node.
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…6270) ### What does this PR do? Hardening follow-up to #46021. It fixes regressions from #46021 and #44618 that were never released, includes more of the open pull requests that fix a crash, and fixes a few crashes that had no pull request. #### Regressions fixed (none was released) - `spyOn(Bun, "$")`, and the same for `"sql"`, `"postgres"` and `"SQL"`, threw "does not support accessor properties yet". - Async `fs.read`, `fs.write` and `zlib.brotliCompress` on a view over a `WebAssembly.Memory` could lose data or copy far more than they needed. - `node:vm` with `vm.constants.DONT_CONTEXTIFY`: `this` in host accessors, prototype handling, `util.types.isProxy`, `Bun.deepEquals`, `assert.deepEqual` and `console.log` of a context. - `zlib` `stream.flush()` threw for arguments it used to accept, and streams had a new enumerable property. - `Bun.Transpiler` `exports.replace` with the name `"default"`. - `process.env.X = 3000` could store the number once the function was JIT-compiled. - `node:sqlite` and `bun:sqlite` could lose rows at exit. - Dev server: stylesheets shared between pages after a build error. - Shell `cp` of a file onto itself exited 1. - `error.stack`: the frame of `require()` reads `at anonymous (unknown)` again. - `import * as process from "process"` followed by `process.on(...)` threw at load. The EventEmitter methods that the module exports now act on `process`. - `delete res.statusCode; res.end()` in a `node:http` handler threw. It sends 200, as in Node. (from #46128) - `node:tls`, `node:https` and `node:http2`: connection teardown and write callbacks behave as in 1.4.3 and Node again. #### Crash fixes Bundler, parser and CSS: #42286, #46092, #46097, #46177, #46239, #36334, #43024, #40769. `bun test`, `--hot` and `--watch`: #30776, #38206, #38974. Shell: #43183, #37743, #46168, #46207, #34900. `node:http`, `node:http2`, `Bun.serve`, streams: #43449, #45380, #44457, #42197, #42485, #38082, #38124, #46074, #45999, #46045. `node:vm`, native addons, workers: #46129, #46198, #45615, #33412, #38031. Dev server: #42790, #42850, #39488. Other: #35991, #38030, #38586, #40526, #41830, #46029, #46078, #46114, and the bug of #42215. #### Behavior changes - `crypto.randomFill(view, cb)` reports `ERR_CRYPTO_OPERATION_FAILED` if it could not fill the view. It used to report success. - A function registered twice on `process` runs twice, as in Node. (#41830) - Under `--hot`, a reload after an uncaught exception cancels the timers that the failed run created. The new run's timers fire, and so do timers and `fs.watchFile` watchers that earlier runs kept on `globalThis`. The reload also resets the exit code to 0. (#38206) - The parent of a Worker no longer gets an `'error'` event for a failed `Bun.serve` request in that Worker. The error is printed, as on the main thread. - `hash.write()` after `digest()` drops the chunk, as in Node. (#35991) - `http2` over TLS with `server.emit("connection", socket)`: `session.socket` is a `TLSSocket` and a `'connection'` listener fires, as in Node. (#38124) - A `slice()` with no type of a body `Blob` has `type === ""`, as in Node. (#46114) - `util.types.isProxy(globalThis)` is false, as in Node. - A write on a `node:net` or `node:tls` socket that is still pending when the connection closes calls back with `ECANCELED`, as in Node. - `HTMLRewriter.on()` throws for a selector that is nested too deeply. - `Bun.Image`: `maxPixels` also bounds PNG metadata, `metadata()` of a GIF reports the size that gets decoded, and a path with a NUL byte throws. (#40526) - `bun build --no-bundle` with the `base64` or `dataurl` loader prints an error. (#36334) - Bundled output for a default-exported function or class expression changes to `var file_default = function name() {}`, as in esbuild. `.name` is unchanged. (#46097) - A Proxy in the prototype chain of a `node:vm` global is allowed. jsdom 30 with `runScripts` needs this. - `bun:sqlite` commits a write that `iterate()` left open when the main thread exits. An explicit `BEGIN` is still rolled back. - When a Worker stops while a native addon's async work is still running, the addon's finalizers run after that work is done, as in Node. - Shell: `mv -n` and `cp -n` don't overwrite, and `cp` reads `R`, `v` and `n` anywhere in a flag group. #### Performance - Ordinary `node:vm` contexts run at the same speed. With `DONT_CONTEXTIFY`, stores to globals and reads of inherited names in a hot loop cost 10 to 20 % more than on `main`. - A `process.env` write costs 20 to 35 % less than after #46021. - An async read into a `WebAssembly.Memory` view looks through the live memories: about 1.5 µs more with one memory. #### Not included - Taken in part, so these should stay open for the rest: #36334, #38974, #39488, #40526, #40769, #42485, #45615, #45999, #46029, #46092, #46114, #46168, #46207, #46239. - Needs a WebKit change: #34655 #39204 #40170 #40253 #41587 #41900 #42699 #42897 #42903 #43084 #43813 #44518 #44949 #45770 #45804 #45827. - #44723 (covered by #46097), #41675, #42753, #38762, #41475, #46016. ### How did you verify your code works? - Every item was reproduced first on release builds of `main`, of its parent and of 1.4.3, and compared with Node v26 where Node has the API. - Every fix has a test that fails on `main` and passes on a debug + ASAN build of this branch, except where that isn't practical (huge inputs, code that only runs on Windows or macOS). - The regressions were checked on grids of calls against the build before #46021 and against 1.4.3. - Bun's own test suites and Node's `test-vm-*`, `test-http2-*` and `test-zlib-*` files for the areas touched.
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Fixes #44925
Problem
res.end("late")setsres._headerbut leavesres.headersSentfalse.res.setHeader()then throwsERR_HTTP_HEADERS_SENT(node:_http_outgoing,setHeader). Express 5res.download()crashes with that uncaught error when a client aborts:sendchecksheadersSent, then callssetHeader().ServerResponse.prototype.end(src/js/node/_http_server.ts:3549) setthis._header = " "without the header state that theheadersSentgetter reads. node:http: the server follows Node (request body, framing, response finish, lifecycle) #43557 added that line. Bun 1.4.2 set neither.Fix
headersSenttrue,_headerset) unless Node'swrite_()would have dropped the chunk of a destroyed response before_implicitHeader(). Then both stay unset, and the replacedwriteHeadwrapper is not called either.write()marks the head sent the same way. Node renders the head before_writeRaw()reports the dead socket.OutgoingMessage.end(), whosewrite_()drops it for a destroyed message before the head renders. Before,end()cleared the chunk first and the head rendered.test/js/node/http/node-http-server-abort-events.test.ts(5 new tests, 4 fail on the unfixed build, thewriteHead()one guards its clause of the condition). Alsonode-http.test.ts,node-http-backpressure.test.ts,node-http-req-complete.test.ts, andtest/js/third_party/express/. Self-reviewed: 1 concern raised, 1 addressed.Background
write()orend().headerStateSymbol(none,assignedafterwriteHead(),sent) is whatres.headersSentreads._headeris a marker set atend()for theOutgoingMessagemethods that gate on it.res.destroyedturns true when the socket emits'close'(Node'semitCloseNT). A handler that callsreq.socket.destroy()and thenres.end()in the same turn seesdestroyed === false, so Node renders the head there._headerline: it fixes the Express path but leavesheadersSentfalse where Node reports true (end()without a chunk on a destroyed response,write()orend()afterreq.socket.destroy()in the handler). Considered derivingheadersSentfrom_header: it does not fix the Express path, where Node sets neither.Downsides
res.setHeader()afterres.end()on a dead socket in 1.4.3 and caughtERR_HTTP_HEADERS_SENTnow sees it in fewer cases. This is the Node behaviour.write()on a dead socket,headersSentis true but_headerstays null. Bun's native path never sets_headerinwrite(), before and after this change.Notes
Node v26.3.0 against this branch,
/tmp/repro44925/matrix.mjsandstandalone.mjs:end(chunk)fromreq.socket 'close'(res destroyed)_headernull,headersSentfalse,setHeaderokend()from'close'setHeaderthrowsreq.socket.destroy()in the handler, thenend(chunk)orend()writeHead(200), then Areq.socket.destroy()in the handler, thenwrite(chunk)headersSenttrue,setHeaderthrows_headernull)new ServerResponse(req),destroy(),end(chunk)setHeaderokBun main before this PR: A to D report
headersSentfalse with_headerset, F reportsheadersSentfalse, G reports both set.The per-call cost on the live-socket path is one boolean and one reference local in
end(). No new native call, allocation, or queue entry.The express suite has one test that times out on main too (
should respond with 404 when wrong method is used), with and without this change.