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Title: Add a check to not allow `addTrailers` on an already ended http reply · Issue #62809 · nodejs/node · GitHub

Open Graph Title: Add a check to not allow `addTrailers` on an already ended http reply · Issue #62809 · nodejs/node

X Title: Add a check to not allow `addTrailers` on an already ended http reply · Issue #62809 · nodejs/node

Description: setHeader / setHeaders have a protection against a mistake: node/lib/_http_outgoing.js Lines 645 to 648 in adeb14a OutgoingMessage.prototype.setHeader = function setHeader(name, value) { if (this._header) { throw new ERR_HTTP_HEADERS_SEN...

Open Graph Description: setHeader / setHeaders have a protection against a mistake: node/lib/_http_outgoing.js Lines 645 to 648 in adeb14a OutgoingMessage.prototype.setHeader = function setHeader(name, value) { if (this._...

X Description: setHeader / setHeaders have a protection against a mistake: node/lib/_http_outgoing.js Lines 645 to 648 in adeb14a OutgoingMessage.prototype.setHeader = function setHeader(name, value) { if (this._...

Opengraph URL: https://github.com/nodejs/node/issues/62809

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Domain: github.com

Hey, it has json ld scripts: 
{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Add a check to not allow `addTrailers` on an already ended http reply","articleBody":"`setHeader` / `setHeaders` have a protection against a mistake:\n\nhttps://github.com/nodejs/node/blob/adeb14a3fdcf19647bff5cf6c964f7c80f3257f9/lib/_http_outgoing.js#L645-L648\n\nhttps://github.com/nodejs/node/blob/adeb14a3fdcf19647bff5cf6c964f7c80f3257f9/lib/_http_outgoing.js#L660-L663\n\n`addTrailers` doesn't, and just assigns to `._trailers` _even if the response is already ended/sent.\n\nhttps://github.com/nodejs/node/blob/adeb14a3fdcf19647bff5cf6c964f7c80f3257f9/lib/_http_outgoing.js#L984-L986\n\nNote: adding this check would be a semver-major change.\n\nE.g. `fastify` incorrectly attempts to do this under some conditions due to a logic mistake.","author":{"url":"https://github.com/ChALkeR","@type":"Person","name":"ChALkeR"},"datePublished":"2026-04-19T00:31:38Z","url":"https://github.com/nodejs/node/issues/62809"}
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#62832https://github.com/nodejs/node/pull/62832
Add a check to not allow addTrailers on an already ended http replyhttps://github.com/nodejs/node/issues/62809#top
#62832https://github.com/nodejs/node/pull/62832
httpIssues and PRs related to the http subsystem.https://github.com/nodejs/node/issues?q=state%3Aopen%20label%3A%22http%22
semver-majorPRs that contain breaking changes and should be released in the next major version.https://github.com/nodejs/node/issues?q=state%3Aopen%20label%3A%22semver-major%22
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on Apr 19, 2026https://github.com/nodejs/node/issues/62809#issue-4289568840
node/lib/_http_outgoing.jshttps://github.com/nodejs/node/blob/adeb14a3fdcf19647bff5cf6c964f7c80f3257f9/lib/_http_outgoing.js#L645-L648
adeb14ahttps://github.com/nodejs/node/commit/adeb14a3fdcf19647bff5cf6c964f7c80f3257f9
node/lib/_http_outgoing.jshttps://github.com/nodejs/node/blob/adeb14a3fdcf19647bff5cf6c964f7c80f3257f9/lib/_http_outgoing.js#L660-L663
adeb14ahttps://github.com/nodejs/node/commit/adeb14a3fdcf19647bff5cf6c964f7c80f3257f9
node/lib/_http_outgoing.jshttps://github.com/nodejs/node/blob/adeb14a3fdcf19647bff5cf6c964f7c80f3257f9/lib/_http_outgoing.js#L984-L986
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http: reject addTrailers after finishhttps://github.com/nodejs/node/commit/b2248fd37020cbffc7415e01f89d44171e4963d9
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