[robobun]

Problem

• server.close(cb) on a node:http (or node:https) server fires cb and 'close' as soon as the in-flight response finishes, while the keep-alive connection that carried it is still open and keeps serving new requests. Node v26.3.0 withholds both until every connection has ended. A server.close(() => process.exit()) drain is told the server is drained while a live client still issues requests into it.
• Cause: emitCloseServer is driven by the native all-closed promise (getBunServerAllClosedPromise, src/js/node/_http_server.ts), whose condition is pending_requests == 0 && !listener. That counts requests, not connections.

Fix

• Gate emitCloseServer on kTrackedConnections.size === 0 and on the native handle being gone, like Node's net.Server#_emitCloseIfDrained. If connections remain, it sets kPendingDrainClose; the last socket's #onClose re-runs it. kRealListen resets the flag, and close(cb) registers cb with once('close') as Node does, so a re-listen cycle cannot fire or block a stale callback.
• closeAllConnections() / closeIdleConnections() keep working after close() dropped the native handle: they walk kTrackedConnections and destroy the plain HTTP sockets (idle ones only, for the latter). Sockets handed to 'upgrade'/'connect' are marked kHandedOff and skipped, which matches Node, where the freed parser takes them off that list.
• Correct because the 'close' signal now tracks the same thing Node tracks (open connections), and the two drain helpers select the same sockets Node's ConnectionsList would.
• Verified: test/js/node/http/node-http-server-close-drain.test.ts (6 tests, 5 fail on main). Also node-http.test.ts, the upstream test-http{,s}-server-close-*, upgrade and CONNECT tests, and the ws, CONNECT and https suites. Self-reviewed plus four bot review rounds: 6 concerns raised, 6 addressed.

Background

• A node:http server in Bun wraps a Bun.serve instance. close() calls stop() on it and drops the handle (this[serverSymbol] = undefined). The native side resolves an "all closed" promise once no request is pending.
• kTrackedConnections is the JS-side set of accepted NodeHTTPServerSockets. A socket joins on accept and leaves in #onClose. getConnections() already reads it. It plays the role of Node's net.Server._connections.
• Node keeps a second, narrower list (ConnectionsList, one entry per live HTTP parser) for closeAllConnections() / closeIdleConnections(). Handing a socket to 'upgrade' or 'connect' frees its parser, so those two methods never touch upgraded or tunnel sockets, while 'close' still waits for them.

Notes

Repro (from the report; node:https behaves the same because https.createServer is http.createServer with TLS options):

import http from "node:http"; import net from "node:net";
const server = http.createServer((req, res) => setTimeout(() => res.end("resp:" + req.url), 200));
server.keepAliveTimeout = 60000;
server.listen(0, "127.0.0.1", () => {
  const c = net.connect(server.address().port, "127.0.0.1");
  let closeCbAt = null, data = "";
  c.on("data", d => data += d);
  c.on("connect", () => {
    c.write("GET /first HTTP/1.1\r\nHost: x\r\n\r\n");
    setTimeout(() => {
      server.close(() => { closeCbAt = Date.now(); });
      setTimeout(() => {
        c.write("GET /second HTTP/1.1\r\nHost: x\r\n\r\n");
        setTimeout(() => { console.log({ closeCbFired: closeCbAt !== null, resps: data.match(/resp:\/\w+/g) }); process.exit(0); }, 900);
      }, 900);
    }, 50);
  });
});

bun 1.4.x: { closeCbFired: true, resps: ["resp:/first","resp:/second"] }. node: closeCbFired: false, same responses.

Tests in node-http-server-close-drain.test.ts (main vs this PR, with main's _http_server.ts swapped in for the first column):

server.close(cb) … keep-alive connection still open              FAIL  pass
https server.close(cb) … keep-alive TLS connection (https.Agent) FAIL  pass
server.close(cb) fires once an idle keep-alive conn is reaped     pass  pass  (control)
closeAllConnections() after close() force-drains the callback    FAIL  pass
closeIdle/closeAllConnections() after close() leave an upgraded
  socket open                                                     FAIL  pass  (fails on the earlier revision of this PR too)
no 'close' on a re-listened server when an earlier conn ends     FAIL  pass

Each test body was also run under node v26.3.0 with assert in place of expect and passes there.

Review history: the post-close() no-op of the drain helpers, the stale pending flag across re-listen, the single-slot close callback colliding after re-listen, Array.from vs $Array.from, and the drain helpers destroying upgraded/CONNECT sockets were raised in review and are each fixed with a covering test.

Relationship to #35839: that PR reworks closeAllConnections() / closeIdleConnections() more broadly (listener stays up). If it lands first, the two fallback branches here become redundant and this PR reduces to the 'close' gate.

A note for anyone re-running the report's standalone script on a debug/ASAN build: its fixed 200 ms close() timer fires before the first request is dispatched there (first dispatch takes about 1 s), which produces an ECONNRESET instead of the bug, on main as well. The tests tie close() to the handler entering instead.

---

[human-review] gate passed · iteration 4 · 2 files touched

fails on main (without fix)

ASAN without fix: BUILD FAILED (no junit output)
$ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" test/js/node/http/node-http-server-close-drain.test.ts
ninja: Entering directory `/workspace/bun/build/debug'
[1/164] gen generated_host_exports.rs
generated_host_exports.rs: 122 exports (host=5, lazy=10, generic=107, rust=0); 242 extern-C blocks audited
[2/164] gen cpp.rs (cppbind)
[3/164] gen JS modules (bundle-modules)
Preprocess modules (13068ms)
Bundle modules (66ms)
Postprocesss modules (97ms)
Bundle Functions (642ms)
Generate Code (31ms)

[13.91s] Bundled "src/js" for development
  2786 kb
  197 internal modules
  13 native modules
  50 internal functions across 16 files
[3/164] cargo bun_runtime → libbun_runtime.a
[4/164] cc obj/codegen/InternalModuleRegistryConstants.S.o
FAILED: rust-target/x86_64-unknown-linux-gnu/debug/libbun_runtime.a 
/workspace/bun/build/release/bun /workspace/bun/scripts/build/stream.ts rust --console --cwd=/workspace/bun --env=CARGO_TERM_COLOR=always --env=BUN_CODEGEN_DIR=/workspace/bun/build/debug/codegen --env=CC=/usr/lib/llvm-21/bin/clang --env=CXX=/usr/lib/llvm-21/bin/clang++ --env=AR=/usr/lib/llvm
... (truncated)

release without fix: 1 FAILED
bun test v1.4.3-canary.1 (d65da482a)

test/js/node/http/node-http-server-close-drain.test.ts:
(pass) server.close(cb) does not fire while a keep-alive connection is still open [26.77ms]
(pass) https server.close(cb) does not fire while a keep-alive TLS connection is still open [43.19ms]
(pass) server.close(cb) fires once an idle keep-alive connection is reaped [5.11ms]
(pass) closeAllConnections() after close() force-drains the withheld callback [4.12ms]
269 |     while (!plainData.includes("ok")) await once(plain, "data");
270 |     for (let i = 0; i < 4; i++) await new Promise<void>(r => setImmediate(r));
271 |     expect(closeCbFired).toBe(false);
272 | 
273 |     server.closeIdleConnections();
274 |     expect(upgradedServerSocket.destroyed).toBe(false);
                                                 ^
error: expect(received).toBe(expected)

Expected: false
Received: true

      at <anonymous> (/workspace/bun/test/js/node/http/node-http-server-close-drain.test.ts:274:44)
(fail) closeIdleConnections()/closeAllConnections() after close() leave an upgraded socket open [6.50ms]
(pass) no 'close' is emitted on a re-listened server when an earlier connection ends [5
... (truncated)

passes on PR (with fix)

ASAN with fix: all passed
$ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" test/js/node/http/node-http-server-close-drain.test.ts
bun test v1.4.3 (f42e98025)

test/js/node/http/node-http-server-close-drain.test.ts:
(pass) server.close(cb) does not fire while a keep-alive connection is still open [1097.32ms]
(pass) https server.close(cb) does not fire while a keep-alive TLS connection is still open [989.99ms]
(pass) server.close(cb) fires once an idle keep-alive connection is reaped [187.85ms]
(pass) closeAllConnections() after close() force-drains the withheld callback [112.19ms]
(pass) closeIdleConnections()/closeAllConnections() after close() leave an upgraded socket open [195.05ms]
(pass) no 'close' is emitted on a re-listened server when an earlier connection ends [228.35ms]

 6 pass
 0 fail
 29 expect() calls
Ran 6 tests across 1 file. [5.93s]
__F:0:S:0

release with fix: all passed
$ bun scripts/build.ts --profile=release
[configured] bun-profile → bun (stripped) in 756ms (unchanged)
ninja: Entering directory `/workspace/bun/build/release'
[1/125] gen generated_host_exports.rs
generated_host_exports.rs: 122 exports (host=5, lazy=10, generic=107, rust=0); 242 extern-C blocks audited
[2/125] gen cpp.rs (cppbind)
[3/125] gen JS modules (bundle-modules)
Preprocess modules (10494ms)
Bundle modules (68ms)
Postprocesss modules (161ms)
Bundle Functions (585ms)
Generate Code (33ms)

[11.35s] Bundled "src/js" for production
  2596 kb
  197 internal modules
  13 native modules
  50 internal functions across 16 files
[3/124] cargo bun_runtime → libbun_runtime.a
�[1m�[92m   Compiling�[0m bun_core v0.0.0 (/workspace/bun/src/bun_core)
�[1m�[92m   Compiling�[0m bun_errno v0.0.0 (/workspace/bun/src/errno)
�[1m�[92m   Compiling�[0m bun_ptr v0.0.0 (/workspace/bun/src/ptr)
�[1m�[92m   Compiling�[0m bun_boringssl_sys v0.0.0 (/workspace/bun/src/boringssl_sys)
�[1m�[92m   Compiling�[0m bun_safety v0.0.0 (/workspace/bun/src/safety)
�[1m�[92m   Compiling�[0m bun_base64 v0.0.0 (/workspace/bun/src/base64)
�[1m�[92m   Compiling�[0m bun_cares_sys v0.0.0 (/workspace/bu
... (truncated)

diff hotspot

src/js/node/_http_server.ts                        |  56 +++-
 .../node/http/node-http-server-close-drain.test.ts | 352 +++++++++++++++++++++
 2 files changed, 398 insertions(+), 10 deletions(-)

gate history · 7 passed · 1 rejected · iteration 4

evidence per changed file

file                                                    reads  edits  tests
src/js/node/_http_server.ts                                33     33     37
test/js/node/http/node-http-server-close-drain.test.ts      8     10     36

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Advanced

Run ID: ea86adeb-9b24-46ae-b3f9-b909e63a16da

📥 Commits

Reviewing files that changed from the base of the PR and between a90b602 and 54af0a0.

📒 Files selected for processing (2)

• src/js/node/_http_server.ts
• test/js/node/http/node-http-server-close-drain.test.ts

Included review availability: Your plan provides up to 10 included reviews per hour; 0 remain after this review.

---

Walkthrough

Changes

HTTP server close draining

Layer / File(s)	Summary
Coordinate deferred close with socket release src/js/node/_http_server.ts	The server tracks pending close state. The close event waits for tracked connections to end. Socket closure schedules final close processing.
Handle close callbacks and connection cleanup src/js/node/_http_server.ts	Server.prototype.close() registers callbacks through the close event. closeAllConnections() and closeIdleConnections() destroy eligible tracked sockets after the native handle is dropped. Handed-off sockets remain open.
Validate keep-alive close behavior test/js/node/http/node-http-server-close-drain.test.ts	Tests cover HTTP and HTTPS keep-alive connections, idle cleanup, forced cleanup, upgraded sockets, and re-listening during a pending close.

Suggested reviewers: cirospaciari, jarred-sumner

Merge Risk: ⚪ Minimal · up to 54af0

HTTP server close completion now waits for tracked connections to drain while preserving handed-off sockets and supporting cleanup controls. Covered shutdown scenarios are passing, with no remaining merge-blocking risk identified.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the primary change: deferring the node:http server close event until all tracked connections end.
Description check	✅ Passed	The description explains the problem, fix, background, verification steps, test results, and scope. It does not use the exact template headings, but it provides the required information in equivalent …

---

_{Comment @coderabbitai help to get the list of available commands.}

[robobun]

^{Updated 6:25 AM PT - Sep 8th, 2026}

❌ @robobun, your commit 54af0a0 has 2 failures in Build #112826 (All Failures):

• test/js/third_party/grpc-js/test-tonic.test.ts - code 1 on 🍎 any aarch64
• test/js/node/test/parallel/test-crypto-dh-leak.js - code 1 on 🐧 13 x64-asan

---

🧪   To try this PR locally:

bunx bun-pr 35837

That installs a local version of the PR into your bun-35837 executable, so you can run:

bun-35837 --bun

[robobun]

Subsumed by #35844, which adds the same kTrackedConnections.size gate and additionally keeps the native handle reachable under a closing flag so closeIdleConnections()/closeAllConnections() keep working after close(), and rewrites both off the tracked set so they no longer touch the listener. The scenario-C test here is covered there as scenario C of the four-scenario harness.

[claude]

All three earlier findings (closeAllConnections/closeIdleConnections no-op after close(), stale kPendingDrainClose across re-listen, and the kCloseCallback "already set" throw) are addressed and covered by new tests. I didn't find further issues this pass. Leaving for a human to weigh the overlap with #35844 (which the author noted subsumes this) and to sign off on the server-close lifecycle change.

What was reviewed:

• emitCloseServer gate on serverSymbol + kTrackedConnections; verified the once('close', cb) switch means the removed callCloseCallback(self) is dead for the server path.
• closeAllConnections/closeIdleConnections fallback: snapshot via Array.from before destroy, and ordering when closeAllConnections() runs before the native promise resolves — the later emitCloseServer still fires because size is 0 by then.
• kRealListen resets kPendingDrainClose; #onClose only re-checks when the flag is set, so a re-listened server with new connections won't spuriously emit.

Extended reasoning...

Overview

This PR changes src/js/node/_http_server.ts to defer the server 'close' event and server.close(cb) callback until every tracked TCP connection has ended, matching Node's net.Server#_emitCloseIfDrained. It introduces a kPendingDrainClose flag, gates emitCloseServer on both serverSymbol (the native handle) and kTrackedConnections.size, has NodeHTTPServerSocket#onClose re-trigger the emit when the last tracked socket drops, resets the flag in kRealListen, and switches the close callback registration from the single-slot setCloseCallback to this.once('close', cb) (matching Node). closeAllConnections() and closeIdleConnections() gain a fallback that iterates kTrackedConnections when close() has already dropped the native handle. A new 4-test file exercises the withheld-callback path, the idle-reap control, the deadline force-drain, and the re-listen guard.

Security risks

None identified. This is event/lifecycle sequencing in the Node HTTP compat layer; no parsing of untrusted input, no auth/crypto, no resource-limit changes.

Level of scrutiny

Medium-high. node:http server close/listen is a widely-exercised compat surface with subtle re-entrancy (re-listen, forced drain, keep-alive). This PR went through two rounds of review that surfaced three real bugs (post-close force-drain no-op, stale pending flag across re-listen, and a "Close callback already set" throw), all now fixed with tests. The once('close', cb) switch is a small but real behavior change (callbacks now stack across cycles like Node instead of throwing on the second), which is the correct direction but worth a human confirming.

Other factors

• The author noted this is subsumed by #35844, which apparently takes a broader approach (keeps the native handle reachable under a closing flag rather than falling back to the tracked set). A human should decide which PR to land.
• Tests are in a new file rather than the existing node-http.test.ts; they use bounded polling (while (!body.includes(...)) await once(socket, 'data') + a few setImmediate turns) rather than sleeps, and each has a finally cleanup. The for (i < 4) setImmediate yield-loop is a mild smell per REVIEW.md but is bounded and comments why.
• I traced the ordering where closeAllConnections() is called synchronously after close() (before the native all-closed promise resolves and sets kPendingDrainClose): sockets are destroyed with the flag still false so #onClose doesn't schedule, but the pending native-promise resolution then runs emitCloseServer with size === 0 and emits — no hang.
• setCloseCallback/callCloseCallback are now unused for the server object (still used for sockets/responses), so removing callCloseCallback(self) from emitCloseServer is safe.

[robobun]

Build #81871: 190 jobs passed, 1 failed. The only red is the pre-existing freebsd x64 build-bun step failure (also failing on main; step-failed-outside-runner). All test lanes either passed or were flaky and passed on retry. node-http-server-close-drain.test.ts is green on every lane that ran it.

Re: #35844, both PRs gate emitCloseServer on kTrackedConnections. This PR is the minimal fix for the reported premature-callback bug plus the force-drain and re-listen guards that review surfaced; #35844 additionally changes closeAllConnections() to leave the listener running (closer to Node, but a behaviour change for existing callers). Either approach fixes the reported scenario; happy to close this if #35844 is preferred.

[robobun]

Triage note: this PR is the remaining carrier for the "server 'close' fires while keep-alive connections are still open" gap. The overlapping PRs have been consolidated: #35839 now owns closeAllConnections() / closeIdleConnections() (listener stays up, both work after close()), and #35844, which bundled both changes, was closed in favour of the two of them.

Two things to pick up here once #35839 lands:

• The post-close() branches this PR adds to closeAllConnections() / closeIdleConnections() become redundant (both methods iterate the tracked set unconditionally there), so this will need a rebase that drops them and keeps only the 'close' gate.
• Scenario D from node:http: gate server.close() on connection drain, not request count #35844's tests (the callback must not fire while a client keeps issuing requests on the surviving connection) is worth folding in; this PR's current tests cover the single in-flight case and the forced drain.

Re-checked today: 3 of the 4 tests here still fail on a fresh main build, so the bug is still live (#35130 gated Bun.serve's drain promise on open connections but explicitly left node:http out).

[robobun]

Rebased onto main (cd3c811) and squashed to one commit. The only conflict was in NodeHTTPServerSocket#onClose: the class body was re-indented on main (#39628), so the hunk was re-applied by hand. Logic is unchanged. closeAllConnections() and closeIdleConnections() keep main's new http1Fallback calls ahead of the tracked-set fallback.

Re-verified on the rebased tree: the four tests in node-http-server-close-drain.test.ts pass with the fix and three fail with main's _http_server.ts swapped in. node-http.test.ts, the test-http{,s}-server-close-* upstream tests, and the http1 fallback upstream tests (test-http-generic-streams, test-http-server-unconsume-consume) are green.

#35844 was closed without merging, so this PR is the open fix for the premature close callback.

[claude]

I reviewed this PR and found no new issues — all three earlier inline findings (post-close() fallback for closeAllConnections/closeIdleConnections, the re-listen guard, and the once('close', cb) switch) are addressed in the current diff. Because this reworks the node:http server 'close' state machine and there's an open coordination question with #35839 per the triage note, a human look at merge order would still be worthwhile.

What was reviewed:

• emitCloseServer gating on serverSymbol and kTrackedConnections.size, with kPendingDrainClose reset in kRealListen — no path emits 'close' on a listening server.
• #onClose re-check races with re-listen — the serverSymbol guard in emitCloseServer covers the nextTick window.
• setCloseCallback/callCloseCallback call sites — server no longer uses the single-slot mechanism; remaining users are socket/ServerResponse only.
• Array.from(tracked) snapshot before destroy loop — safe against mutation from #onClose deleting during iteration.

Extended reasoning...

Overview

The PR changes src/js/node/_http_server.ts (~50 lines) to defer the server 'close' event until kTrackedConnections is empty, mirroring Node's net.Server#_emitCloseIfDrained. It introduces kPendingDrainClose, adds a re-check in the socket #onClose handler, guards emitCloseServer against a re-listened handle, resets the flag in kRealListen, switches the close callback from the single-slot setCloseCallback to once('close', cb), and adds post-close() fallback paths to closeAllConnections()/closeIdleConnections() that iterate the tracked set. Four new tests cover the withheld callback, the idle-reap control, the force-drain deadline pattern, and the re-listen guard.

Security risks

None identified. This is lifecycle/event-ordering logic in the Node compat layer; no auth, crypto, untrusted-input parsing, or resource-limit changes.

Level of scrutiny

High. node:http server close is a critical, widely-exercised path, and the change is a state-machine adjustment (a persistent flag armed in one place, cleared in two, checked in a third) rather than a mechanical fix. The repo's Node/Web compat guidance calls for extra scrutiny here.

Other factors

I previously left three inline findings on earlier revisions; all were addressed and the corresponding tests were added. The current bug-hunting pass found nothing. I verified: (1) callCloseCallback/setCloseCallback are no longer used on the server object — remaining call sites at lines 135/945/1059/3430/3618 are all socket or ServerResponse; (2) emitCloseServer is reachable only from the native all-closed promise and from #onClose, both of which now hit the serverSymbol guard if the server was re-listened between scheduling and execution; (3) the destroy loops snapshot via Array.from so tracked.delete(this) during socket.destroy() doesn't skip entries.

The author's 2026-08-13 triage note flags that #35839 owns closeAllConnections()/closeIdleConnections() going forward and that this PR's post-close() fallback branches become redundant once that lands. That's a merge-order decision a maintainer should make, not something I can resolve. Given the critical path and that coordination question, deferring rather than approving.

[robobun]

Status after the rebase (cd3c811):

• CI build #103017: every red lane is test/cli/install/bun-audit.test.ts, a snapshot break on main from the 1.4.1 version bump (normalizeBunSnapshot now rewrites the <1.4.1 range in the mime advisory). It is reported separately and is not related to this diff. node-http-server-close-drain.test.ts passes on every lane.
• Merge order with node:http: make closeAllConnections()/closeIdleConnections() leave the listener alone and work after close() #35839: it is still open, so the post-close() branches in closeAllConnections() / closeIdleConnections() stay in this PR for now. They are what makes the close(cb); setTimeout(closeAllConnections) deadline pattern release the callback. If node:http: make closeAllConnections()/closeIdleConnections() leave the listener alone and work after close() #35839 lands first, I will rebase and drop those two branches, and only the 'close' gate remains. If this lands first, node:http: make closeAllConnections()/closeIdleConnections() leave the listener alone and work after close() #35839 replaces them.
• Scenario D from the triage note (callback withheld while the client keeps using the connection) is what the first test asserts: /second is served on the surviving connection after close(cb) and the callback is still withheld afterwards.

No further changes planned unless #35839 merges or a reviewer asks for one.

[robobun]

Rebased onto main again (f98b816). One conflict in kRealListen: #40041 sets this.listening = true at the same spot where this PR resets kPendingDrainClose. Kept both lines. No other change.

Re-verified on the rebased tree: the four drain tests pass with the fix, three fail with main's _http_server.ts swapped in. The listen-order tests from #40041 ('listening' on the next tick, EADDRINUSE retry, the http and https 'beforeExit' re-emit tests) pass with this change, as do node-http.test.ts, the upstream test-http{,s}-server-close-* tests, child_process_ipc_handle.test.ts, and the cluster suite.

[claude]

I re-reviewed after the rebases and didn't find any new issues — the three earlier findings (post-close() force-drain no-op, re-listen firing a stale 'close', and the kCloseCallback slot collision) are each addressed with a covering test. Since this changes user-visible server.close() timing and there's an open merge-order question with #35839 that a maintainer should decide, a human look on landing is still worthwhile.

Checked this pass:

• emitCloseServer gates on both serverSymbol and kTrackedConnections.size; kRealListen resets kPendingDrainClose, so a re-listen can't inherit the flag.
• Ordering: if the last #onClose runs before the native promise resolves (flag still false), the promise-driven emitCloseServer still emits since connections.size === 0 — no lost-wakeup.
• closeAllConnections() pre-close() path is unchanged; the new tracked-set fallback only runs when serverSymbol is already gone.

Extended reasoning...

Overview

This PR defers node:http Server's 'close' event (and the server.close(cb) callback) until every tracked TCP connection has ended, matching Node's net.Server#_emitCloseIfDrained. Previously Bun fired it as soon as the native server's pending-request count hit zero, even though a keep-alive connection was still open and could serve further requests. The fix adds a kPendingDrainClose flag armed when the native all-closed promise resolves with connections outstanding; the last socket's #onClose re-checks and schedules the emit. closeAllConnections() / closeIdleConnections() gain a fallback that iterates kTrackedConnections when close() has already dropped the native handle, and close() now registers its callback via this.once('close', cb) instead of the single-slot kCloseCallback. Four new tests cover: the withheld callback while a keep-alive connection stays open, the idle-at-close control path, the force-drain deadline pattern, and the re-listen guard.

Security risks

None identified. This is event-ordering / lifecycle logic in the JS Node-compat layer; no parsing of untrusted input, no auth/crypto, no new external surface. The Array.from(tracked) snapshot uses the global Array.from, which is technically user-tamperable, but that pattern already appears in node/http2.ts and node/fs.ts and is not a security boundary here.

Level of scrutiny

Moderate-to-high. This is a user-visible behavior change to server.close() semantics — the callback now fires later than it used to, which is more correct (matches Node) but could surprise code that relied on the old early fire. Graceful-shutdown paths are exactly where subtle races live, and I raised three of them in earlier passes (all fixed with tests). The change is well-scoped to one file and the state machine is now sound as far as I can trace: every path that can arm kPendingDrainClose has a corresponding path that either emits or resets it.

Other factors

I've reviewed this PR three times previously; each round surfaced a real bug that was fixed with a dedicated test, and this pass found nothing new. The two rebases since my last review (onto #39628's re-indent and #40041's next-tick listen) were mechanical per the author's notes and the diff bears that out. CI is green on all test lanes. The open coordination point is #35839, which the author says will supersede the closeAllConnections()/closeIdleConnections() fallback branches here — a maintainer should decide whether to land this now and let #35839 replace those branches, or wait. That's a landing/sequencing call, not a correctness concern with this diff, so I'm deferring rather than approving.

[robobun]

Re-checked against the ledger re-sighting and pushed 051ab46 (rebased onto main, plus one new test).

The https face is the same code path: https.createServer is http.createServer with TLS options (src/js/node/https.ts:517, and https.Server is http.Server), so the 'close' gate covers it. It was not covered by a test, so this push adds one: https server.close(cb) does not fire while a keep-alive TLS connection is still open. It drives the browser-shaped case through https.Agent({ keepAlive: true, maxSockets: 1 }): a slow response in flight, close(cb), then a second request that the agent sends on the same TLS connection. It asserts the second request is served on the same client port and that the callback stays withheld until agent.destroy().

Fail-before and pass-after on the rebased tree, with main's _http_server.ts swapped in for the first column:

                                                        main   PR
server.close(cb) … keep-alive connection still open     FAIL   pass
https server.close(cb) … keep-alive TLS connection      FAIL   pass
server.close(cb) … idle keep-alive connection reaped    pass   pass   (control)
closeAllConnections() after close() force-drains        FAIL   pass
no 'close' on a re-listened server                      FAIL   pass

The standalone script from the report also passes on this build for both http and https (closeCbFiredBefore=false, both requests served on the same port, matching node v26.3.0). One note on running it against a debug/ASAN build: the fixed 200 ms close() timer fires before the first request is even dispatched there (the first dispatch takes about 1 s), so the script reports an ECONNRESET instead of the bug. That happens on main too. Tying the close() call to the handler entering, which is what the tests do, makes it deterministic.

On listening=false in the report: node also reports false right after close() (its listening getter reads _handle, which close() clears), so that part matches node and is unchanged here.

Also green: node-http.test.ts (154 pass, including the 'beforeExit' and listen-order tests from #40041), the upstream test-http{,s}-server-close-* tests, test-http-generic-streams, test-http-server-unconsume-consume, and the server timeout, abort-event and https suites.

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@test/js/node/http/node-http-server-close-drain.test.ts`:
- Line 38: Remove the inline test-body comments that merely restate the
regression scenario, leaving setup, actions, and assertions unchanged. In
test/js/node/http/node-http-server-close-drain.test.ts, remove the comments at
lines 38, 51-53, 60-61, 69, 124, 130, 137, 254, 261, and 268-270.

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[robobun]

CI on d65da48 (#112795): the only red lane is test/js/node/test/parallel/test-crypto-dh-leak.js on debian x64-asan, which is failing on main as well (marked pre-existing, tracked separately) and is unrelated to node:http. Every other failure passed on retry. node-http-server-close-drain.test.ts and the rest of the node:http suites are green on all lanes. Nothing left to change here; this is ready for a maintainer.

[claude]

Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@src/js/node/_http_server.ts`:
- Line 467: Update both fallback cleanup predicates in closeAllConnections to
exclude upgraded sockets while retaining active regular HTTP requests for
cleanup; use the existing upgraded-socket state marker associated with
upgradeToTunnel() and preserve socket.destroy() for eligible sockets. Add
regression coverage after close() confirming CONNECT and upgraded connections
remain open when the native handle is absent.

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[claude]

LGTM — all four rounds of earlier feedback are now addressed (closeAll/closeIdle fallback after close(), the serverSymbol guard + kPendingDrainClose reset in kRealListen, the once('close', cb) switch, and the $Array.from primordial in a90b602).

Also confirmed setCloseCallback/callCloseCallback are still live for socket- and response-level close paths (lines 135, 950, 3624), so the removal from emitCloseServer/close() does not leave them dead.

Extended reasoning...

Overview

This PR changes node:http Server#close() to defer the 'close' event and its callback until every tracked keep-alive connection has ended, matching Node's net.Server#_emitCloseIfDrained semantics. It adds a kPendingDrainClose flag, gates emitCloseServer on both serverSymbol being cleared and kTrackedConnections being empty, re-triggers emission from the socket _destroy path when the last tracked connection drops, extends closeAllConnections()/closeIdleConnections() to iterate JS-side tracked sockets after the native handle is gone, resets the pending flag on re-listen, and swaps the server-level setCloseCallback for once('close', cb). Five new tests cover HTTP, HTTPS, idle-reap, force-drain-after-close, and re-listen.

Security risks

None. This is event-timing compat for server shutdown; no auth, crypto, path handling, or untrusted-input parsing is touched. The $Array.from primordial fix closes the tamper-resistance gap I raised last round.

Level of scrutiny

Medium — Node compat with observable event ordering, which REVIEW.md calls out as needing exact match. This PR has been through four review iterations here: the closeAll/closeIdle post-close no-op, the missing re-listen guard, the stale kCloseCallback slot, and the non-primordial Array.from were each raised and each fixed in a subsequent commit. The current diff reflects all of them, and this run's hunt found nothing further.

Other factors

I checked whether removing callCloseCallback(self) from emitCloseServer and setCloseCallback(this, cb) from Server.prototype.close leaves those helpers dead (REVIEW.md's "delete helpers whose last caller you rewired") — it does not: setCloseCallback is still used for sockets (line 135) and responses (line 950), and callCloseCallback is still called at line 3624 and from internal/http.ts, so they remain live for non-server objects. The tests use port: 0, harness TLS certs, no external network, and await observable conditions (the fixed 4×setImmediate yields are bounded turn drains letting the server's internal nextTick chain settle before asserting the callback has not fired — not wall-clock sleeps). No outstanding third-party CHANGES_REQUESTED; the one coderabbit inline was resolved by a non-author.

[robobun]

Pushed 196b137 + 54af0a0 for the upgraded-socket finding, which was real: after close(), the fallback in closeIdleConnections() destroyed a socket handed to 'upgrade'/'connect' (it has no _httpMessage), and closeAllConnections() destroyed it too. Node leaves both alone because the handoff frees the parser and takes the socket off ConnectionsList.

The handoff path (detachSocketListenersForHandoff) now marks the socket, and both fallbacks skip marked sockets. 'close' still waits for them, as Node's _connections does. New test closeIdleConnections()/closeAllConnections() after close() leave an upgraded socket open: an upgraded echo connection plus a mid-request keep-alive connection, close(), then closeIdleConnections() reaps only the plain one and closeAllConnections() touches neither; the echo keeps working and the callback fires only once the upgraded socket is destroyed. It fails on the previous revision (upgradedServerSocket.destroyed is true right after closeIdleConnections()), passes now, and the same body passes under node v26.3.0. 6/6 in the file, plus the ws, CONNECT, test-http-upgrade-* and test-http-connect* suites. PR description updated to the current shape.

[claude]

Code review found no issues

No high-confidence issues detected in this change.

[robobun]

CI on 54af0a0 (#112826): 177 jobs passed, 2 red lanes, neither related to this diff:

• test/js/node/test/parallel/test-crypto-dh-leak.js on debian x64-asan: pre-existing on main, tracked separately.
• test/js/third_party/grpc-js/test-tonic.test.ts on darwin aarch64 only (1 CANCELLED: Call cancelled): a grpc-js (node:http2) client against a Rust tonic server. It does not go through node:http's Server, and it passed on every other lane. Reported separately as well.

Everything else that failed passed on retry. node-http-server-close-drain.test.ts (6 tests) and the other node:http suites are green on all lanes. All review threads are resolved; nothing further planned here.

[Jarred-Sumner]

Superseded by #43557, which is merged (5d5f03f). It fixes this once for the whole node:http server and carries the tests over.

[robobun]

Confirmed. I checked main at 5d5f03f, which includes #43557:

• The repro from the report prints closeCbFiredAtMs: null with both responses served, the same as node v26.3.0. A build without the change still exits 86.
• The keep-alive Agent shape from the re-sighting passes for node:http and node:https: the callback stays withheld and the second request is served on the same connection.
• test/js/node/http/node-http-server-close-drain.test.ts on main has 21 tests, which include the six from this PR. All 21 pass.

Nothing is left to do here.