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server.upgrade(res, { headers }) on a node:http response checks ENDED and
SOCKET_CLOSED once, then converts options.headers. The conversion runs
user code (a getter, a toString()). If that code ends the response,
upgrade() returns false but still writes the converted headers after the
finished response. Check the flags again after the conversion, as the
Request branch already does.
Fixes #43027
|
Updated 2:13 AM PT - Sep 17th, 2026
✅ @robobun, your commit d800c27f9ef27ec4e5c36a0f8277d950b7e231fd passed in 🧪 To try this PR locally: bunx bun-pr 43028That installs a local version of the PR into your bun-43028 --bun |
WalkthroughChangesThe NodeHTTPResponse upgrade path now rechecks response state after user code runs during header processing. Tests cover getters, WebSocket upgrade response guard
Suggested reviewers: Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: 🟡 Moderate · up to A response ended from an upgrade option getter can still proceed with a WebSocket upgrade, producing invalid output after the completed HTTP response. Move the guard outside option processing before merging. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@test/js/first_party/ws/ws.test.ts`:
- Line 1301: Refactor the parameterized test around the “writes nothing when …
in options.headers ends the response” case to use describe.each(). Move the case
table to describe.each(), pass headers through the describe callback, and put
the existing assertion in an it() block while preserving all test behavior.
- Around line 1272-1318: Extend the existing options.headers response-ending
test cases with a custom iterable whose iterator calls res.end() during header
conversion. Verify that bunServer.upgrade returns false and the received
response contains only the completed response without any upgrade-written bytes,
matching the getter and toString cases.
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Inline comments:
In `@src/runtime/server/server_body.rs`:
- Line 1763: Move the response-state check in the upgrade path to after all
optional option getters, including opts.fast_get(data) and
opts.fast_get(headers), and immediately before NodeHTTPResponse::upgrade().
Preserve the existing handling for non-nullish headers while ensuring
getter-triggered res.end() or socket closure prevents upgrade. Add regression
coverage for both data and headers getters.
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| .fast_remove(HTTPHeaderName::SecWebSocketExtensions); | ||
| } | ||
| // Option getters and the headers conversion may have ended the response. | ||
| if is_ended_or_closed() { |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
🔎 Supported by static analysis
🏁 Script executed:
sed -n '1650,1795p' src/runtime/server/server_body.rs
rg -n -C 5 'fn upgrade|pub fn upgrade|NodeHTTPResponse::upgrade|\\.upgrade\\(' src/runtime/server
sed -n '1250,1345p' test/js/first_party/ws/ws.test.tsRepository: oven-sh/bun
Length of output: 11158
🏁 Script executed:
rg -n -C 8 'NodeHTTPResponse::upgrade|fn upgrade\(' src/runtime/server src/runtime | head -240
printf '\n--- relevant tests ---\n'
sed -n '1280,1395p' test/js/first_party/ws/ws.test.tsRepository: oven-sh/bun
Length of output: 6924
🏁 Script executed:
sed -n '527,610p' src/runtime/server/NodeHTTPResponse.rs
printf '\n--- all relevant upgrade regression tests ---\n'
rg -n -C 6 'options\.data|headers.*null|headers: null|headers: undefined|ends the response|bunServer\.upgrade\(res' test/js/first_party/ws/ws.test.tsRepository: oven-sh/bun
Length of output: 5631
Recheck response state after all option getters.
opts.fast_get(data) and opts.fast_get(headers) can execute user code. A data getter can call res.end(). A headers getter can call res.end() and return null or undefined. These paths skip the current nested check and reach NodeHTTPResponse::upgrade(), which does not check ENDED or SOCKET_CLOSED.
Move the state check after the complete optional-options block and before node_http_response.upgrade(). Add regression cases for both getters. The current tests cover only non-nullish headers conversion.
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In `@src/runtime/server/server_body.rs` at line 1763, Move the response-state
check in the upgrade path to after all optional option getters, including
opts.fast_get(data) and opts.fast_get(headers), and immediately before
NodeHTTPResponse::upgrade(). Preserve the existing handling for non-nullish
headers while ensuring getter-triggered res.end() or socket closure prevents
upgrade. Add regression coverage for both data and headers getters.
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Beyond the inline findings, I also checked whether the &*node_http_response reference held across the user-JS re-entry (option getters, FetchHeaders::create_from_js) can dangle when that code calls res.end(): mark_request_as_done releases at most two of the three initial refs (NodeHTTPResponse.rs:2620-2624, 730-733), and the JS-wrapper ref is only dropped at finalize, which cannot run synchronously while res is an argument on the stack — so the pointer stays valid and the re-read of flags after re-entry is sound.
Extended reasoning...
Two verified findings are posted inline (the data-getter / null-headers exit that bypasses the new check, and the ws handleProtocols socket.end() path that the ENDED | SOCKET_CLOSED predicate does not catch), so this PR needs author attention regardless. The one thing worth recording beyond them is the pointer-provenance question raised by src/CLAUDE.md: the NodeHTTPResponse branch materializes unsafe { &*node_http_response } before running user JS. I traced the refcount: the object starts with 3 refs (HTTP response, JS object, server handler); res.end() reaching mark_request_as_done derefs the handler ref and conditionally the async-promise ref, but the JS-object ref is released only via GC finalization, which cannot occur synchronously during upgrade() because res is a live argument. The closure re-reads flags.get() on each call, so the post-re-entry check observes fresh state. Not approving: the inline findings show the fix covers only one of the exits from the option block.
| // The option getters and the headers conversion run user | ||
| // code, which may have ended the response. | ||
| if is_ended_or_closed() { | ||
| return Ok(JSValue::FALSE); | ||
| } | ||
| if let Some(raw_response) = node_http_response.raw_response.get() { | ||
| // we must write the status first so that 200 OK isn't written | ||
| raw_response.write_status(b"101 Switching Protocols"); |
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🔴 pre-existing, left open by this fix: a data getter (or a headers getter returning null) that calls res.end() still upgrades the ended response and returns true. The new check at server_body.rs:1764 sits inside the headers branch, so when options.headers is absent or nullish the code falls through to node_http_response.upgrade(...) at server_body.rs:1782 with no re-check. Fix: re-check is_ended_or_closed() after every user-code re-entry point, i.e. once right before the upgrade( call at 1782 as well as before write_status, so the data getter, a nullish headers getter and the headers conversion are all covered. [also at: src/runtime/server/server_body.rs:1766 - pre-existing, partial fix: a caller whose data or headers option getter ends the response still gets upgrade() returning true and the socket adopted as a WebSocket after a finished 200 response.]
Extended reasoning...
The PR's purpose is to re-check the response after option getters run user code; the check only covers one of the two exits from the option block. In the NodeHTTPResponse branch, opts.fast_get(global, jsc::BuiltinName::data) at server_body.rs:1715 runs a user getter. If that getter calls res.end(), NodeHTTPResponse.rs:2025 sets Flags::ENDED and NodeHTTPResponse.rs:2028 writes the final 200 OK response on the socket, but raw_response is not cleared. Back in on_upgrade, if options.headers is missing, opts.fast_get(..headers) returns None, the block ends, and line 1782 calls node_http_response.upgrade(...) with no flag check (the new check at 1764 is only reached inside the if let Some(headers_value) branch). In NodeHTTPResponse.rs:590 self.raw_response.take() is Some, so raw_response.upgrade::<ServerWebSocket> writes 101 Switching Protocols after the finished response, marks UPGRADED, creates a ServerWebSocket and returns true. The same happens when a headers getter ends…
Verification: pre-existing — the base branch already fails by this route and the PR does not reach it, but the PR's own stated purpose ("re-check after the option getters run user code") covers only one of the two exits from the option block. Trigger: server.upgrade(nodeHttpResponse, opts) (reached via Symbol.for("::bunternal::"), the same access the PR's new test uses) where opts.data is a getter…
| let is_ended_or_closed = || { | ||
| node_http_response | ||
| .flags | ||
| .get() | ||
| .contains(NodeHTTPResponseFlags::SOCKET_CLOSED) | ||
| { | ||
| .intersects(NodeHTTPResponseFlags::ENDED | NodeHTTPResponseFlags::SOCKET_CLOSED) | ||
| }; |
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🟣 pre-existing, not blocking: pre-existing: an app that rejects the handshake with socket.end(...) while server.upgrade(res, …) runs still gets upgrade() = true and a ws connection event for the rejected client, as on base and in the linked issue's repro. The predicate is_ended_or_closed at src/runtime/server/server_body.rs:1676-1681 reads only NodeHTTPResponse.flags. The node:http socket's end() goes through us_socket_buffered_js_write (raw write + shutdown()) and sets neither ENDED nor SOCKET_CLOSED. Fix: the predicate (used at both checks) must also refuse when the socket is shut down or the JSNodeHTTPServerSocket is ended, e.g. us_socket_is_shut_down on raw_response.socket(). [also at: src/runtime/server/server_body.rs:1680 - pre-existing, partial fix: a ws app whose handleProtocols (or any headers getter/toString) calls socket.end(...) still gets upgrade() returning true and a 'connection' callback for a socket it already ended — the linked issue's own repro.]
A small fix can ride a push you are already making; otherwise a short reply is enough.
Extended reasoning...
Issue #43027's reproduction is a ws handleProtocols that returns an object whose toString() calls socket.end('HTTP/1.1 400 ...'). The ws shim (src/js/thirdparty/ws.js:1566-1569) passes that object as headers: { 'sec-websocket-protocol': protocol }, so toString() runs inside…
Verification: pre-existing. Trigger: user code that runs inside server.upgrade(res, { headers }) (a header value's toString(), a getter, an iterator — e.g. the linked issue's ws handleProtocols object) calls socket.end(...) on the node:http upgrade socket rather than res.end(). The new guard is_ended_or_closed (src/runtime/server/server_body.rs:1676-1681) reads only NodeHTTPResponse.flags for…
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Code review found no new issues
No new issues were found in this update; 2 findings from earlier reviews are still open above.
Still open from earlier reviews (2):
- 🔴
src/runtime/server/server_body.rs:1769—pre-existing, left open by this fix: a data getter (or a headers getter returning null) that calls res.end() still upgr… - Also unresolved: 1 minor or pre-existing.
If you have decided not to act on one of these findings, resolve its thread (a reply alone leaves it open) and the next review stops counting it. To review this commit again now, use Re-run on its "Claude Code Review" check.
…inish, lifecycle) (#43557) One pull request for the open `node:http` server pull requests. Each root cause is fixed once, and each pull request's tests are carried over. Node is the reference: every scenario was run under Node and under Bun from one script, and the outputs were compared. Fixes #4733 Fixes #18613 Fixes #40350 Fixes #43155 Fixes #43297 Fixes #43513 Fixes #43527 Fixes #25632 Fixes #31301 Fixes #43027 Fixes #43163 Fixes #43342 Fixes #43344 Fixes #43370 Fixes #43490 Fixes #43512 Fixes #43519 Each of these has a repro that is wrong on Bun 1.4.3, right on this branch, and the same as Node. | Issue | Not closed by this PR, because | | --- | --- | | #30501 (msal-node keeps Bun alive at exit) | Probably fixed. The repro copies the teardown of msal-node. The package itself was not run. | | #14430 (yarn: "does not support SSL") | Probably fixed. `response.hasOwnProperty("socket")` is now `true`. yarn itself was not run. | | #39681 (`server.setTimeout` callback after destroy) | Probably fixed. The repro is the deterministic case of #39686. The script in the issue depends on timing and on Windows. | | #43455 (`req.complete`, nine flows) | Partially addressed. Flows 1, 2, 3, 5 and 7 are fixed, and flow 6 was already right. Flow 8 (a socket timeout while the body of an Upgrade request arrives) and flow 9 (a request that `stream.pipeline()` destroyed never reports `complete`) are not. Flow 4 differs only in `_readableState.ended`. | ### What changes for users | Area | Before | After (same as Node) | | --- | --- | --- | | `req.pause()` | The socket stops at once. `req.complete` stays `false` for a small body. | The body is received until the buffer is full. Then the socket stops. | | `res.end()` before the body arrives | `req` gets `'end'` and `'close'` at once, and the body is lost | The request completes when its body really ends | | `res.destroy()` in the middle of a body | `'end'` with bytes missing | `aborted`, then `ECONNRESET` | | `socket.destroy()` inside the `'request'` listener | The body that came with the head is dropped | That body is still delivered | | `'finish'` and the `end()` callback | Fire when `end()` buffers the bytes | Fire when the last bytes have left the socket | | A response that closes the connection | The server half-closes and waits for the peer | The socket closes right behind the FIN | | `'drain'` after a later write flushed the backlog | Lost. `pipe(res)` could hang. | Emitted | | A pipelined request whose body continues after the previous response ends | Body dropped, no response, `server.close()` hangs | Delivered | | CONNECT and Upgrade tunnel sockets | Keep reading when paused or full | Stop reading. `_read()` starts them again. | | A tunnel write that waits for a drain when the client goes away | Its callback, the callbacks of the writes behind it and the `end()` callback never run | They run with an error before `'close'` | | Upgrade request with a body, paused in its listener | The body flows away | The request keeps its body | | `ws` on a reused keep-alive socket | Writes after the Upgrade could stall | Sent | | A raw `socket.write()` behind a response that still drains (the 400 for a bad pipelined request, the reply of a `'clientError'` listener) | Lands in the middle of that response | Sent after it | | `server.close()` | Could report closed while connections were open | Waits for every connection. An idle tunnel does not keep the process alive. | | `closeAllConnections()` on a listening server | Also stops the listener and destroys tunnels and WebSockets | Destroys only the HTTP connections | | `Proxy-Connection: close` (node:http only) | Ignored. The connection stays open. | Ends the connection, like `Connection: close` | | A response larger than 16 KB, also in `Bun.serve` and over TLS | Up to 4 `send()` calls for each chunk. Slower than Node in most cases. | One write for the writes of one tick. 1.1x to 2.7x the requests per second of main, and faster than Node. | | `socket.destroy()` and then `res.end()` in a listener | (this PR, earlier) `req` ended as if it were complete | `'aborted'`, then `ECONNRESET` | | `emit('connection')` or http2 `allowHTTP1`: the response ends while the listener still reads the body | The rest of the body is dropped | The body is complete | | `httpValidation: "relaxed"`, `Content-Length` or `Transfer-Encoding` in trailers | Accepted | `HPE_INVALID_CONTENT_LENGTH`, `HPE_INVALID_TRANSFER_ENCODING` | | `req.complete` inside `'connect'`, and inside `'upgrade'` without a body | `false` | `true` | | `optimizeEmptyRequests`: `socket.parser.incoming` after the response | Keeps the request alive on an idle connection | `null` | | A HEAD or OPTIONS request with `Content-Length` | The body is dropped, and `req.complete` is `true` before it comes | The request has its body | | `res.end(chunk)` after the client went away | `finished` and `writableEnded` stay `false`, no `'prefinish'` | The response ends | | An HTTP/1.0 request with an `Expect` header | `100 Continue`, `'checkContinue'`, `'checkExpectation'` or a 417 | A plain `'request'` | | The idle sweep of `close()` and `closeIdleConnections()` | Could destroy a connection that was still receiving a request, or whose response was still draining | Closes only idle connections | ### Design | Piece | What it is | | --- | --- | | Request body state | `None / Pending / Complete / Aborted / Upgraded / Detached`. Only the last chunk sets `Complete`. One function, `leave_pending`, is the only other way out of `Pending`. | | Read flow control | One path: `push()` returning false stops the socket, `_read()` starts it. Both native pause buffers are removed: no read is copied and replayed. | | "This read is parsed" signal | `notifyWhenReadParsed()` sets a uws state bit. uws delivers a `readParsed` event after the read. It replaces a `setImmediate`. | | Close during a parse | One uws bit defers a close to the end of the current message. | | Response finish | A response is finished when it has ended and the socket has fully drained. | | Idle connection | One rule, `HttpResponse::closeIfIdle()`. A connection is idle when it receives no request (head or body) and no response is in flight, queued or undrained. The sweep of `close()` and `closeIdleConnections()` both use it. | | Idle tunnel | A tunnel at read EOF with nothing left to send. uws reports it to the server through the connection filter (`-3`, `+3`, `-4`). It still counts for `'close'`, but it does not hold the event loop, like a libuv handle in that state. | | Server `'close'` | One native close promise per `listen()`. `close()` records whether its sweep left nothing open. Then a `listen()` in the same tick cannot hold `'close'` back, as in `net.Server._emitCloseIfDrained`. | | Raw socket writes | While uws holds response bytes (its buffer, the zero-copy tail of a `res.write()`, the cork buffer), a raw write goes through `AsyncSocket::write`, the path a 1xx line takes. So the order on the wire is the order of the calls. | | Upgrade verdict | One scanner and one verdict, shared by the parser and the dispatcher. | | llhttp | Updated from 9.3.0 to 9.4.2, as Node v26.5.0 vendors it, plus one local patch (see below). Node v26.5.1 and later vendor 9.4.3. That update is not in this PR. | The parser changes also tighten request framing so that it agrees with llhttp in more cases. There is no new API surface. ### A pause holds from the next read The copy of the rest of a read (`nodeHttpPausedSpill`), its replay from a posted task and the nested parse are removed. Like in Node, the rest of the read that caused a pause is still parsed, and the socket stops at the next read. usockets reads up to 512 KB in one call. libuv reads 64 KB. | One paused, unread request (client sends 64 MB) | Bytes held | | --- | --- | | Node 25.6 | 131,018 | | This pull request | 524,234 | The price is in one case. A client sends 512 KB of small pipelined requests (19,418 of them) and never reads. Each handler answers with its own 64 KB body: | Handler | Runtime | Requests dispatched | RSS | | --- | --- | --- | --- | | Answers at once | Node 26.3 | 2,425 | +177 MB | | Answers at once | main | 41 | +9 MB | | Answers at once | This PR | 2,425 | +171 MB | | Answers one tick later | Node 26.3 | 4,850 | +336 MB | | Answers one tick later | main | 2,426 | +181 MB | | Answers one tick later | This PR | 4,850 | +330 MB | Release builds on Linux x64. This PR now does what Node does. main held fewer responses, mostly for a handler that answers at once. On macOS one read can return all 512 KB. There, Bun 1.4.3 already reached +951 MB for the handler that answers one tick later, and Node reached +1,294 MB. `server.maxRequestsPerSocket` bounds it. ### Performance #### Responses larger than 16 KB are faster, and now faster than Node On main, a response that did not fit the 16 KB uWS cork buffer released the cork. After that, each piece was its own `send()`: the buffered head, the chunk-size line, the data, the `\r\n` and the last chunk. Over TLS, each 2-byte piece was also its own record. Two changes fix that, for `Bun.serve` and for node:http: | Change | Effect | | --- | --- | | A write that does not fit goes out with the cork buffer and its framing in one vectored write | No copy is added. Over TLS, the records of all the pieces share the write batch that one `SSL_write` loop already had. | | The cork buffer holds 128 KB, up from 16 KB. Only a write of 16 KB or less is copied into it, as before. | Several writes in one tick go out in one write, like in Node. A longer write still goes out without a copy. | The bytes on the wire are the same. The vectored write uses `sendmsg()` with the flags that `send()` uses. Write syscalls for one response: | Response | Node 26.3 | main | This PR | | --- | --- | --- | --- | | 4 x `res.write(16 KB)` | 1 | 16 | 1 | | 40 x `res.write(2 KB)` | 1 | 16 | 1 | | `res.end(64 KB)` | 1 | 2 | 1 | | 256 KB file, `.pipe(res)` | 4 | 16 | 5 | Throughput (req/s, the mean of 2 rounds). Node v26.3.0, main `97246d044e`, this PR `fe0ed1fbea`, with the method below: | Case | Node | main | This PR | main / Node | PR / Node | PR / main | | --- | --- | --- | --- | --- | --- | --- | | http, 4 x `res.write(16 KB)` | 17,735 | 6,983 | 19,160 | 0.39x | 1.08x | 2.74x | | https, 4 x `res.write(16 KB)` | 11,720 | 6,110 | 15,510 | 0.52x | 1.32x | 2.54x | | http, 40 x `res.write(2 KB)` | 9,879 | 6,140 | 14,980 | 0.62x | 1.52x | 2.44x | | https, 40 x `res.write(2 KB)` | 6,981 | 5,541 | 11,780 | 0.79x | 1.69x | 2.13x | | http, `res.end(64 KB)` | 18,535 | 16,528 | 19,889 | 0.89x | 1.07x | 1.20x | | http, 256 KB file `.pipe(res)` | 2,684 | 2,375 | 2,719 | 0.88x | 1.01x | 1.15x | | https, `res.end(64 KB)` | 11,894 | 14,586 | 16,426 | 1.23x | 1.38x | 1.13x | | http, GET hello (control) | 55,994 | 70,989 | 71,958 | 1.27x | 1.29x | 1.01x | main was slower than Node in six of these eight cases. This PR is faster than Node in all eight. `Bun.serve`, measured on `a771572a8d`, before the larger cork buffer (req/s, the mean of 2 rounds): | Case | main | PR | Change | | --- | --- | --- | --- | | Direct stream, 4 x 16 KB | 6,826 | 12,479 | +83% | | 64 KB string | 16,944 | 20,145 | +19% | | TLS, 64 KB string | 15,045 | 16,892 | +12% | | hello (control) | 83,957 | 83,137 | -1.0% | These runs are on loopback, where the kernel send buffer is 2.6 MB and the work of the receiver runs inside `send()`. That is the best case for fewer writes. A new connection over a real network takes about 46 KB in its first write on Linux. The rest waits in the socket buffer, as it would after separate writes. #### Small responses are unchanged A small response is already one `recvfrom` and one `sendto` on both builds. `perf` puts 66% of the time of a hello-world server in the kernel, on both builds. CI release builds on Linux x64: main `97246d044e` (the merge base) against this PR `8834cd0787`. Both use the same WebKit. The server runs on one pinned core. `oha` sends 64 connections for 5 s after a 2 s warm-up. There are 2 rounds, and the order of the builds alternates. "Change" compares the means of the two rounds. Framework servers from `bun-perf-tester` (req/s): | Server | main, round 1 | main, round 2 | PR, round 1 | PR, round 2 | Change | | --- | --- | --- | --- | --- | --- | | express | 49,803 | 51,103 | 49,968 | 50,263 | -0.7% | | fastify | 61,214 | 61,105 | 60,705 | 60,668 | -0.8% | | node:http | 70,934 | 71,405 | 73,178 | 71,053 | +1.3% | | elysia | 84,696 | 85,096 | 85,027 | 84,882 | +0.1% | | `Bun.serve` | 89,020 | 89,099 | 88,168 | 88,373 | -0.9% | node:http paths that this PR changes (req/s): | Case | main, round 1 | main, round 2 | PR, round 1 | PR, round 2 | Change | | --- | --- | --- | --- | --- | --- | | GET hello | 70,226 | 70,341 | 70,151 | 72,359 | +1.4% | | POST, 16 KB body | 47,446 | 47,789 | 48,191 | 48,785 | +1.8% | | 64 KB response in four writes | 6,885 | 6,894 | 6,834 | 6,868 | -0.6% | | Pipelined keep-alive, depth 8 | 94,063 | 93,294 | 92,909 | 93,809 | -0.3% | p99 latency (ms), the higher of the two rounds: | Server | main | PR | | --- | --- | --- | | express | 1.94 | 1.91 | | fastify | 1.52 | 1.55 | | node:http | 1.11 | 1.12 | | elysia | 0.98 | 0.96 | | `Bun.serve` | 0.82 | 0.83 | RSS (MB), one pass of 8 s of load: | Server | Build | Start | Under load | 5 s idle | 15 s idle | | --- | --- | --- | --- | --- | --- | | express | main | 39 | 94 | 61 | 57 | | express | PR | 40 | 92 | 60 | 57 | | fastify | main | 41 | 91 | 58 | 55 | | fastify | PR | 41 | 91 | 58 | 55 | | node:http | main | 20 | 64 | 43 | 40 | | node:http | PR | 20 | 65 | 45 | 41 | | elysia | main | 28 | 46 | 36 | 35 | | elysia | PR | 29 | 46 | 37 | 36 | | `Bun.serve` | main | 14 | 30 | 22 | 22 | | `Bun.serve` | PR | 14 | 30 | 22 | 22 | Every change is within 2%. fastify and `Bun.serve` hello are lower in both rounds, by about 1%. `Bun.serve` hello shows the same -1.0% in the control row above, so a small real cost there is possible. The RSS pass ran at the same time as the throughput runs, on other cores. The commits after `8834cd0787` change tests and add one version check to the node:http dispatcher. They were not measured. ### Supersedes | Theme | Pull requests | | --- | --- | | Request body | #43592 #43579 #38196 #43518 #43602 #43408 #43427 #43597 #43555 #43456 #43466 | | Tunnels | #43570 #43485. #43596 is a duplicate of #43570. | | Parser | #43182 #43161 #43326 #43327 #40505 #43363 #42532 #42194 | | Response write | #39386 #43371 #43548 #43499 #43496 #43464 #42008 #43549 | | Response finish | #40351 #43021 #41822 #43473 #42068 #35207 #43425 #43503 | | Lifecycle | #43413 #39686 #43028 #42727 #42622 #42610 #35837 #35839 #37825 #37749 #43376 #35268 | | JS API | #41691 #41738 #38036 #42462 #36527 #39718 #37964. #42947 merged on its own. | The close drain, `resetAndDestroy()`, the pending write callback handling and the response `'close'` ordering come from #42622 and #42727 by @steipete. The diagnosis and the tests for the stalled `ws` writes come from his #42610. Not included: | Pull request | Reason | | --- | --- | | #33061 | main already enforces `headersTimeout` and `requestTimeout` | | #41672 | It makes `http.createServer({ key, cert })` stop serving TLS. That needs a product decision. | | #37543 | A type refactor with no tests and no user-visible change | | #35465 | It makes `http.Server` extend `net.Server`. Only the prototype chains were joined. The `net.Server` constructor never ran, so `_handle` and `_connections` were `undefined`, and `_emitCloseIfDrained()` emitted `'close'` on a listening server. The server is backed by uWS, not `node:net`. | | The `AutoFlusher` removal in #42622 | It makes `flushHeaders()` flush at once. That is a performance change with no relation to the rest. | ### Tests | Check | Result on a debug build (macOS arm64) | Head | | --- | --- | --- | | Every test file that this PR touches (28 files) | 1,866 pass, 2 fail. The 2 failures are `serve.test.ts` "bounds memory when proxying ... to a stalled client". They fail the same way on a debug build of main. | `83af4da4a3`, run before the last commit of main came in | | `test/js/third_party/express` (9 files) and the `body-parser` test | 299 pass, 0 fail | `83af4da4a3`, run before the last commit of main came in | | Node 25.6 against Bun, 32 scenarios from two scripts (event order, framing, lifecycle) | No regression against Bun 1.4.3 | `0ff1a23f61` | | Every vendored Node `test-http-*` and `test-https-*` file, plus the `test-net-*` and `test-tls-*` files for pause, write, end and close | 535 of 537 exit 0. `test-http-agent-keepalive.js` and `test-https-timeout.js` fail on that debug build. Both pass on every CI lane. | `daee05fcfd` (before the rebase) | | The tests that depend on what the kernel takes in one send, on Windows Server 2019 x64 and Windows 11 arm64 | pass | `3eef223328` (x64), `a29289bcc1` (arm64) | | CI build 120191 (Linux, macOS and Windows, release and ASAN) | every lane passed | `daee05fcfd` (before the rebase) | Each new test fails on Bun 1.4.3, or on the commit before its fix for a fault that this branch introduced. The two tests over the limit are `node-http-connect.test.ts` ("tests should run on bun") and `node-http-syscall-fault.test.ts` ("racing a queued drain"). Each starts a debug subprocess that needs more than 5 s on this machine. Both pass on CI. ### Changes in the last push The branch is rebased on main (`daee05fcfd` was the head before). It is now linear. Four regressions against main, each with a test that fails without its fix: | Case | main | Before this push | Now (same as Node) | | --- | --- | --- | --- | | `emit('connection')` or http2 `allowHTTP1`: `res.end()` on a request that nobody reads | `'end'`, `'close'` | No events | `'end'`, `'close'` | | The same server, an unread 32 MB body | 0 bytes held | 32 MB held | 0 bytes held | | A NUL in a header value with `httpValidation: "relaxed"` (client, `HTTPParser`, `emit('connection')` server) | Accepted | The process spins forever | `HPE_INVALID_HEADER_TOKEN` | | `Connection: close`, body in the same read as the head, a 20 KB response before the body is read | `'end'` with an empty body | No events on `req` | `'end'` with the body, `'close'` | | An empty line on an idle keep-alive connection, then `server.close()` | 0 s | About 6 s | 0 s | | Fix | Where | | --- | --- | | The finish listener of a fallback connection dumps an unread request, like Node's `resOnFinish` | `http1_server_fallback.ts` | | llhttp patch: `llhttp__internal__c_test_lenient_flags_20` is false for a NUL. The relaxed state does not consume a NUL, and the next state sent it back there. 9.4.3 has the same loop. | `llhttp.c`, noted in its `README.md` | | A node:http socket that `onData` is parsing gets the close gate of `onData`, also when a large write released the cork | `HttpResponse.h` `uncorkCompletedResponse()` | | A read that starts no message leaves an idle connection idle | `HttpContext.h` `onData` | The open review threads are fixed in `8834cd0787`: `closeAllConnections()`, `Proxy-Connection: close`, five comments cut to one line, and the test of two overlapping listeners, which now waits on events. With the generation gate in `emitCloseServer` removed, that test fails in both cases. `AsyncSocketData` keeps its bools together, which takes it from 56 to 48 bytes per socket. `http.Server` no longer extends `net.Server` (see "Not included"). The special case for it in `Ipc.ts` is gone too. `child.send(msg, httpServer)` still throws `ERR_INVALID_HANDLE_TYPE`, and its test stays. <details><summary>Changes since the first revision (2988a61)</summary> Merged with main at `c8e1f6fa5b`. The one conflict was #43708 (`req.socket` emits `'end'` and `'error'`). Its state bit `HTTP_NODE_PEER_ENDED` moved to bit 22, because bit 19 is `HTTP_NODE_NOTIFY_READ_PARSED` here. Its 15 tests run in `node-http-server-abort-events.test.ts` next to the tests of this branch (103 pass). CI on `2988a610c` had ten red tests from four causes. They are fixed: - `ed882e5e99`: `write()` to a response without a body (HEAD, 204) does not wait for unsent bytes. - `811f817704`: an idle tunnel does not hold the event loop after `server.close()`. Four vendored Node tests timed out on every platform. - `0697deec11`, `d428824c08`, `7aec062d14`: the write callback tests use a body that backs up a loopback socket, and accept what Winsock does. - `c7af1c1615`: two tests from main asserted the old `close()` contract. Review findings, each reproduced against Node v26.3.0 and fixed with a test that fails without the fix: - `d4d2b783ea`, `2cc79939bb`, `45141abca9`, `9a63dbc470`, `80a23a1822`: the idle rule. A keep-alive connection is idle again when its body ends after its response. A connection that owes a queued pipelined response, that still receives a request head or body, or whose response still drains is not idle. - `87d8904aa3`, `7eca4f7806`: `close(cb)` followed by `listen()` in the same tick reports `'close'`, also for an https server whose only connection was idle. - `3fd7b25382`: a paused pipelined request behind a response that still drains stops the connection. The first revision read 512 MiB of 512 MiB into memory. - `2d1a5e2d8d`, `33e4683a8a`, `539cb41eb9`, `197c7dfc29`, `0490e3540b`: raw socket writes stay behind every unsent response byte. The cases were a CONNECT pipelined behind a response that still drains (its `200` landed at offset 2.6 MB of a 64 MiB body), a zero-length tunnel write (it hung the tunnel), the 400 replies above, the zero-copy tail of a large `res.write()`, the cork buffer, and Windows 11, where the kernel takes the whole response and refuses the next send. - `0abd39c133`: an upgrade from the request's `'end'` listener keeps the body bytes out of the WebSocket. The connection closed with 1006 right after the 101. - `5aafc61aa6`: the callback of a small `res.write()` that the kernel refuses at the uncork runs on the drain. Reproduced on Windows 11 only. - `a29289bcc1`: a tunnel write that waits for a drain settles its callbacks when the connection closes. Known differences from Node that this PR leaves: - A handler that calls `res.end()` and then `server.close()` closes its keep-alive connection at once. Node waits for the `keepAliveTimeout`. - A pipelined Upgrade behind a response that still drains is served as a plain request. - An `end()` on a tunnel with no write pending, while the response before the CONNECT still drains, closes both directions after the flush. Node half-closes. - A raw `req.socket.write(big)` and `req.socket.end()` with no `res.end()` sends every byte but no FIN. main loses bytes here. - A CONNECT socket that is given back with `server.emit('connection', socket)` answers only the first of several pipelined requests. main answers none. - A large write from an `'upgrade'` listener stalls while the body of that Upgrade request is still pending. A second `listen()` on a listening server does not throw. Both are the same on main. - A tunnel write that fails because the client went away fails its callbacks but emits no `'error'`. Node emits `ECONNRESET`. A new `'error'` could end a process that has no listener for it. </details> <!-- robobun:evidence:begin --> --- **no test proof** · iteration 8 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/web/fetch/fetch.stream.test.ts, test/js/node/url/url.test.ts, test/js/node/tls/tls-syscall-fault.test.ts, test/js/node/net/node-net-server.test.ts, test/js/node/http/node-http.test.ts, test/js/node/http/node-http-syscall-fault.test.ts, test/js/node/http/node-http-server-close-drain.test.ts, test/js/node/http/node-http-connect.test.ts, test/js/node/http/node-http-backpressure.test.ts, test/js/node/child_process/child_process_ipc_handle.test.ts, test/js/bun/http/serve.test.ts, test/js/bun/http/serve-syscall-fault.test.ts, test/js/bun/http/bun-server.test.ts <!-- robobun:evidence:end --> --------- Co-authored-by: Jarred Sumner <jarred@jarredsumner.com> Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
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Confirmed: main at 5d5f03f has the recheck in |
2 participants
Problem
server.upgrade(res, { headers })on anode:httpresponse (the path thewspackage uses) can write the converted headers after user code ended the response. The client receivesHTTP/1.1 200 OK ... Content-Length: 0\r\n\r\nx-a: 1\r\n.upgrade()returnsfalseas expected, but the bytes are on the wire.NodeHTTPResponsebranch ofon_upgradeinsrc/runtime/server/server_body.rs. It checksENDEDandSOCKET_CLOSEDonce, at line 1676. Then it readsoptions.dataandoptions.headersand callsFetchHeaders::create_from_js. All of these run user code (a getter, atoString(), an iterator). Then it writes the status and the headers with no second check.Fix
ENDED | SOCKET_CLOSEDagain after the headers conversion, beforewrite_statusandto_uws_response. Returnfalseif the response ended in between.Requestbranch already does after its option getters (upgrader.is_aborted_or_ended() || upgrader.did_upgrade_web_socket()).test/js/first_party/ws/ws.test.ts(a getter and atoString()that end the response). Both fail on the released build with the exact bytes from the issue and pass with this change. Also ran all ofws.test.ts,test/js/node/http/node-http-with-ws.test.ts, and the upgrade tests intest/js/bun/http/serve.test.ts.Background
node:httpupgrade socket exposes itsNodeHTTPResponsethroughSymbol.for("::bunternal::"). Thewsshim passes that object toserver.upgrade()with the selected subprotocol as a header.NodeHTTPResponse.flagsrecords the response state.ENDEDis set byres.end().SOCKET_CLOSEDis set when the TCP socket closes.FetchHeaders::create_from_jsturns a plain object, aHeaders, or an iterable into aFetchHeaders. To read the values it calls into JS, so any of them can run arbitrary user code.Fixes #43027
Notes
The issue also reports a segfault on
1.4.3-canary.1+c6b7fcb5bthroughwswith ahandleProtocolswhosetoString()callssocket.end(...). That script does not crash on the released build or on a debug build of630e921db0here. It is not part of this change.The
wshandleProtocolspath only passessec-websocket-protocol, whichon_upgraderemoves from the headers before it writes them. So that path writes no extra header bytes. The test uses a plain header (x-a) so that the write is visible on the wire.