http: add writeEarlyHints function to ServerResponse #44180

wingleung · 2022-08-08T18:27:46Z

Similar to the writeContinue and writeProcessing functions, we could introduce a writeEarlyHints function where we could write the early hints response in a slightly friendlier way

response._writeRaw('HTTP/1.1 103 Early Hints\r\nLink: <\/styles.css>; rel=preload; as=style\r\n\r\n', 'ascii')

would become

response.writeEarlyHints('</styles.css>; rel=preload; as=style')

// or in case of multiple links
response.writeEarlyHints(
  [
    '</globals.css>; rel=preload; as=style',
    '</styles.css>; rel=preload; as=style'
  ]
)

Problem: multiple headers

_writeRaw() cannot be used with multiple headers so I folded the headers into one line.

Link: </styles.css>; rel=preload; as=style, </scripts.js>; rel=preload; as=script

an alternative way to write this is the following

  this._writeRaw('HTTP/1.1 103 Early Hints\r\n', 'ascii');
  this._writeRaw('Link: </styles.css>; rel=preload; as=style\r\n', 'ascii');
  this._writeRaw('Link: </scripts.js>; rel=preload; as=script\r\n\r\n', 'ascii');

however, this also folds into a oneliner, so I think prefolding it before calling _writeRaw() just once was better.

The problem is these folded headers may work now but could become deprecated in future http releases. So maybe I should just write _writeRaw() multiple times and look into unfolding or prevent the folding of the sent header elsewhere 🤔

thoughts?

Resources

discussion about making folding obsolete in future http releases 👉 https://lists.w3.org/Archives/Public/ietf-http-wg/2015JulSep/0256.html
obs-fold 👉 https://www.ietf.org/rfc/rfc7230.html

nodejs-github-bot · 2022-08-08T18:27:50Z

Review requested:

@nodejs/http
@nodejs/net

mcollina

lgtm, solid work. It seems Chrome supports them now:

https://developer.chrome.com/blog/early-hints/

Could you add them to HTTP/2 too? Or it would be better to do it in a follow-up PR?

nodejs-github-bot · 2022-08-08T19:29:55Z

CI: https://ci.nodejs.org/job/node-test-pull-request/45935/

doc/api/http.md

lib/_http_server.js

test/parallel/test-http-early-hints-multiple-links.js

ShogunPanda

LGTM!

wingleung · 2022-08-09T11:34:08Z

lgtm, solid work. It seems Chrome supports them now:

https://developer.chrome.com/blog/early-hints/

Could you add them to HTTP/2 too? Or it would be better to do it in a follow-up PR?

@mcollina good idea! I'll have to look into the http2 implementation first, I haven't read up on how the stream internals work exactly, first thought is to add it here but I'm not sure yet how it would work in a stream. Will have another look

mcollina

What should happen if the array is empty? Could you add a test for this case?

lib/_http_server.js

lib/internal/validators.js

test/parallel/test-http-early-hints-multiple-links.js

test/parallel/test-http-early-hints.js

mscdex · 2022-08-09T15:47:55Z

Also what should happen when neither a string nor array is passed in? Is a 103 without headers permitted? Should we throw an exception? Either way we should also add tests for other value types.

wingleung · 2022-08-09T20:57:32Z

Also what should happen when neither a string nor array is passed in? Is a 103 without headers permitted? Should we throw an exception? Either way we should also add tests for other value types.

@mscdex I added an else clause that will throw an ERR_INVALID_ARG_VALUE exception if it's not a string or an array. test case 👉 test/parallel/test-http-early-hints-invalid-argument.js

wdyt?

wingleung · 2022-08-09T21:04:47Z

What should happen if the array is empty? Could you add a test for this case?

@mcollina I think there will be scenarios where we want to create a links variable, do some manipulations on that based on the resource content and then pass it on to writeEarlyHints(), so if we would have content that results in an empty array then I think we can be graceful with it and just do nothing.

As opposed to invalid types like objects (what @mscdex mentioned ☝️ ), I think that's more of a programmatic error so in that case I'm throwing ERR_INVALID_ARG_VALUE

wdyt?

Added test cases

lib/internal/validators.js

mscdex · 2022-08-09T21:39:24Z

minor nit: perhaps we could consolidate the tests into one file for this new feature?

Additionally we should test that the function throws when it should.

mcollina

lgtm

test/parallel/test-http-early-hints.js

wingleung · 2022-08-10T12:35:52Z

minor nit: perhaps we could consolidate the tests into one file for this new feature?

Additionally we should test that the function throws when it should.

@mscdex because the invalid argument test throws an exception where I process.exit(0) afterwards, the other test might fail. I can work around it by adding a timeout but I think it's more scalable if we separate the throwable tests to their dedicated files 🤔 I kept the 3 happy flow test in 1 file though

LiviaMedeiros

The first commit in PR should start with affected sybsystem, which is http (src mostly refers to generic changes in C++ parts of code). This can be fixed by rebasing and force-pushing, or on landing stage.

lib/_http_server.js

doc/api/http.md

Co-Authored-By: Matteo Collina <matteo.collina@gmail.com> Co-Authored-By: Livia Medeiros <livia@cirno.name> PR-URL: nodejs#44180 Reviewed-By: Robert Nagy <ronagy@icloud.com> Reviewed-By: Paolo Insogna <paolo@cowtech.it> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: LiviaMedeiros <livia@cirno.name>

Notable Changes: cli: * (SEMVER-MINOR) add `--watch` (Moshe Atlow) #44366 esm: * remove specifier resolution flag (Geoffrey Booth) #44859 * convert `resolve` hook to synchronous (Jacob Smith) #43363 http: * (SEMVER-MINOR) add writeEarlyHints function to ServerResponse (Wing) #44180 * (SEMVER-MAJOR) use Keep-Alive by default in global agents (Paolo Insogna) #43522 build: * (SEMVER-MAJOR) remove dtrace & etw support (Ben Noordhuis) #43652 * (SEMVER-MAJOR) remove systemtap support (Ben Noordhuis) #43651 Deprecation and Removals: * (SEMVER-MAJOR) runtime deprecate exports double slash maps (Guy Bedford) #44495 Semver-Major Commits: * [aa3a572] - (SEMVER-MAJOR) build: remove dtrace & etw support (Ben Noordhuis) #43652 * [38f1e27] - (SEMVER-MAJOR) build: remove systemtap support (Ben Noordhuis) #43651 * [2849283] - (SEMVER-MAJOR) crypto: remove non-standard `webcrypto.Crypto.prototype.CryptoKey` (Antoine du Hamel) #42083 * [a1653ac] - (SEMVER-MAJOR) crypto: do not allow to call setFips from the worker thread (Sergey Petushkov) #43624 * [a4fa526] - (SEMVER-MAJOR) fs: add directory autodetection to fsPromises.symlink() (Livia Medeiros) #42894 * [bb4891d] - (SEMVER-MAJOR) fs: add validateBuffer to improve error (Hirotaka Tagawa / wafuwafu13) #44769 * [950a441] - (SEMVER-MAJOR) fs: remove coercion to string in writing methods (Livia Medeiros) #42796 * [41a6d82] - (SEMVER-MAJOR) fs: harden fs.readSync(buffer, options) typecheck (LiviaMedeiros) #42772 * [2275faa] - (SEMVER-MAJOR) fs: harden fs.read(params, callback) typecheck (LiviaMedeiros) #42772 * [29953a0] - (SEMVER-MAJOR) fs: harden filehandle.read(params) typecheck (LiviaMedeiros) #42772 * [4267b92] - (SEMVER-MAJOR) http: use Keep-Alive by default in global agents (Paolo Insogna) #43522 * [f529f73] - (SEMVER-MAJOR) lib: brand check event handler property receivers (Chengzhong Wu) #44483 * [6de2673] - (SEMVER-MAJOR) lib: enable global WebCrypto by default (Antoine du Hamel) #42083 * [73ba883] - (SEMVER-MAJOR) lib: use private field in AbortController (Joyee Cheung) #43820 * [7dd2f41] - (SEMVER-MAJOR) module: runtime deprecate exports double slash maps (Guy Bedford) #44495 * [587367d] - (SEMVER-MAJOR) perf_hooks: expose webperf global scope interfaces (Chengzhong Wu) #44483 * [364c0e1] - (SEMVER-MAJOR) perf_hooks: fix webperf idlharness (Chengzhong Wu) #44483 * [e0ab8dd] - (SEMVER-MAJOR) process: make process.config read only (Sergey Petushkov) #43627 * [481a959] - (SEMVER-MAJOR) readline: remove `question` method from `InterfaceConstructor` (Antoine du Hamel) #44606 * [77e5856] - (SEMVER-MAJOR) src: turn embedder api overload into default argument (Alena Khineika) #43629 * [dabda03] - (SEMVER-MAJOR) src: per-environment time origin value (Chengzhong Wu) #43781 * [2b32985] - (SEMVER-MAJOR) stream: use null for the error argument (Luigi Pinca) #44312 * [57ff476] - (SEMVER-MAJOR) test: remove duplicate test (Luigi Pinca) #44051 * [77def91] - (SEMVER-MAJOR) tls,http2: send fatal alert on ALPN mismatch (Tobias Nießen) #44031 PR-URL: #44626 Co-authored-by: Ruy Adorno <ruyadorno@google.com>

mcollina · 2022-10-06T17:07:58Z

This PR must be backported / released together with #44820.

cc @nodejs/releasers

Co-Authored-By: Matteo Collina <matteo.collina@gmail.com> Co-Authored-By: Livia Medeiros <livia@cirno.name> PR-URL: #44180 Reviewed-By: Robert Nagy <ronagy@icloud.com> Reviewed-By: Paolo Insogna <paolo@cowtech.it> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: LiviaMedeiros <livia@cirno.name>

Notable changes: * cli: * (SEMVER-MINOR) add `--watch` (Moshe Atlow) #44366 * fs: * (SEMVER-MINOR) add `FileHandle.prototype.readLines` (Antoine du Hamel) #42590 * http: * (SEMVER-MINOR) add writeEarlyHints function to ServerResponse (Wing) #44180 * http2: * (SEMVER-MINOR) make early hints generic (Yagiz Nizipli) #44820 * src: * (SEMVER-MINOR) add detailed embedder process initialization API (Anna Henningsen) #44121 * util: * (SEMVER-MINOR) add default value option to parsearg (Manuel Spigolon) #44631

Notable changes: * cli: * (SEMVER-MINOR) add `--watch` (Moshe Atlow) #44366 * fs: * (SEMVER-MINOR) add `FileHandle.prototype.readLines` (Antoine du Hamel) #42590 * http: * (SEMVER-MINOR) add writeEarlyHints function to ServerResponse (Wing) #44180 * http2: * (SEMVER-MINOR) make early hints generic (Yagiz Nizipli) #44820 * src: * (SEMVER-MINOR) add detailed embedder process initialization API (Anna Henningsen) #44121 * util: * (SEMVER-MINOR) add default value option to parsearg (Manuel Spigolon) #44631 PR-URL: #44968

Notable changes: * cli: * (SEMVER-MINOR) add `--watch` (Moshe Atlow) #44366 * fs: * (SEMVER-MINOR) add `FileHandle.prototype.readLines` (Antoine du Hamel) #42590 * http: * (SEMVER-MINOR) add writeEarlyHints function to ServerResponse (Wing) #44180 * http2: * (SEMVER-MINOR) make early hints generic (Yagiz Nizipli) #44820 * lib: * (SEMVER-MINOR) refactor transferable AbortSignal (flakey5) #44048 * src: * (SEMVER-MINOR) add detailed embedder process initialization API (Anna Henningsen) #44121 * util: * (SEMVER-MINOR) add default value option to parsearg (Manuel Spigolon) #44631 PR-URL: #44968

Notable Changes: cli: * (SEMVER-MINOR) add `--watch` (Moshe Atlow) #44366 esm: * remove specifier resolution flag (Geoffrey Booth) #44859 * convert `resolve` hook to synchronous (Jacob Smith) #43363 http: * (SEMVER-MINOR) add writeEarlyHints function to ServerResponse (Wing) #44180 * (SEMVER-MAJOR) use Keep-Alive by default in global agents (Paolo Insogna) #43522 build: * (SEMVER-MAJOR) remove dtrace & etw support (Ben Noordhuis) #43652 * (SEMVER-MAJOR) remove systemtap support (Ben Noordhuis) #43651 Deprecation and Removals: * (SEMVER-MAJOR) runtime deprecate exports double slash maps (Guy Bedford) #44495 Semver-Major Commits: * [aa3a572] - (SEMVER-MAJOR) build: remove dtrace & etw support (Ben Noordhuis) #43652 * [38f1e27] - (SEMVER-MAJOR) build: remove systemtap support (Ben Noordhuis) #43651 * [2849283] - (SEMVER-MAJOR) crypto: remove non-standard `webcrypto.Crypto.prototype.CryptoKey` (Antoine du Hamel) #42083 * [a1653ac] - (SEMVER-MAJOR) crypto: do not allow to call setFips from the worker thread (Sergey Petushkov) #43624 * [a4fa526] - (SEMVER-MAJOR) fs: add directory autodetection to fsPromises.symlink() (Livia Medeiros) #42894 * [bb4891d] - (SEMVER-MAJOR) fs: add validateBuffer to improve error (Hirotaka Tagawa / wafuwafu13) #44769 * [950a441] - (SEMVER-MAJOR) fs: remove coercion to string in writing methods (Livia Medeiros) #42796 * [41a6d82] - (SEMVER-MAJOR) fs: harden fs.readSync(buffer, options) typecheck (LiviaMedeiros) #42772 * [2275faa] - (SEMVER-MAJOR) fs: harden fs.read(params, callback) typecheck (LiviaMedeiros) #42772 * [29953a0] - (SEMVER-MAJOR) fs: harden filehandle.read(params) typecheck (LiviaMedeiros) #42772 * [4267b92] - (SEMVER-MAJOR) http: use Keep-Alive by default in global agents (Paolo Insogna) #43522 * [f529f73] - (SEMVER-MAJOR) lib: brand check event handler property receivers (Chengzhong Wu) #44483 * [6de2673] - (SEMVER-MAJOR) lib: enable global WebCrypto by default (Antoine du Hamel) #42083 * [73ba883] - (SEMVER-MAJOR) lib: use private field in AbortController (Joyee Cheung) #43820 * [7dd2f41] - (SEMVER-MAJOR) module: runtime deprecate exports double slash maps (Guy Bedford) #44495 * [587367d] - (SEMVER-MAJOR) perf_hooks: expose webperf global scope interfaces (Chengzhong Wu) #44483 * [364c0e1] - (SEMVER-MAJOR) perf_hooks: fix webperf idlharness (Chengzhong Wu) #44483 * [e0ab8dd] - (SEMVER-MAJOR) process: make process.config read only (Sergey Petushkov) #43627 * [481a959] - (SEMVER-MAJOR) readline: remove `question` method from `InterfaceConstructor` (Antoine du Hamel) #44606 * [77e5856] - (SEMVER-MAJOR) src: turn embedder api overload into default argument (Alena Khineika) #43629 * [dabda03] - (SEMVER-MAJOR) src: per-environment time origin value (Chengzhong Wu) #43781 * [2b32985] - (SEMVER-MAJOR) stream: use null for the error argument (Luigi Pinca) #44312 * [57ff476] - (SEMVER-MAJOR) test: remove duplicate test (Luigi Pinca) #44051 * [77def91] - (SEMVER-MAJOR) tls,http2: send fatal alert on ALPN mismatch (Tobias Nießen) #44031 PR-URL: #44626 Co-authored-by: Ruy Adorno <ruyadorno@google.com>

watch mode (experimental): Running in 'watch' mode using `node --watch` restarts the process when an imported file is changed. Contributed by Moshe Atlow in [#44366](#44366) Other notable changes: * fs: * (SEMVER-MINOR) add `FileHandle.prototype.readLines` (Antoine du Hamel) #42590 * http: * (SEMVER-MINOR) add writeEarlyHints function to ServerResponse (Wing) #44180 * http2: * (SEMVER-MINOR) make early hints generic (Yagiz Nizipli) #44820 * lib: * (SEMVER-MINOR) refactor transferable AbortSignal (flakey5) #44048 * src: * (SEMVER-MINOR) add detailed embedder process initialization API (Anna Henningsen) #44121 * util: * (SEMVER-MINOR) add default value option to parsearg (Manuel Spigolon) #44631 PR-URL: #44968

watch mode (experimental): Running in 'watch' mode using `node --watch` restarts the process when an imported file is changed. Contributed by Moshe Atlow in #44366 Other notable changes: * fs: * (SEMVER-MINOR) add `FileHandle.prototype.readLines` (Antoine du Hamel) #42590 * http: * (SEMVER-MINOR) add writeEarlyHints function to ServerResponse (Wing) #44180 * http2: * (SEMVER-MINOR) make early hints generic (Yagiz Nizipli) #44820 * lib: * (SEMVER-MINOR) refactor transferable AbortSignal (flakey5) #44048 * src: * (SEMVER-MINOR) add detailed embedder process initialization API (Anna Henningsen) #44121 * util: * (SEMVER-MINOR) add default value option to parsearg (Manuel Spigolon) #44631 PR-URL: #44968

Notable Changes: cli: * (SEMVER-MINOR) add `--watch` (Moshe Atlow) #44366 esm: * remove specifier resolution flag (Geoffrey Booth) #44859 * convert `resolve` hook to synchronous (Jacob Smith) #43363 http: * (SEMVER-MINOR) add writeEarlyHints function to ServerResponse (Wing) #44180 * (SEMVER-MAJOR) use Keep-Alive by default in global agents (Paolo Insogna) #43522 build: * (SEMVER-MAJOR) remove dtrace & etw support (Ben Noordhuis) #43652 * (SEMVER-MAJOR) remove systemtap support (Ben Noordhuis) #43651 Deprecation and Removals: * (SEMVER-MAJOR) runtime deprecate exports double slash maps (Guy Bedford) #44495 Semver-Major Commits: * [aa3a572] - (SEMVER-MAJOR) build: remove dtrace & etw support (Ben Noordhuis) #43652 * [38f1e27] - (SEMVER-MAJOR) build: remove systemtap support (Ben Noordhuis) #43651 * [2849283] - (SEMVER-MAJOR) crypto: remove non-standard `webcrypto.Crypto.prototype.CryptoKey` (Antoine du Hamel) #42083 * [a1653ac] - (SEMVER-MAJOR) crypto: do not allow to call setFips from the worker thread (Sergey Petushkov) #43624 * [a4fa526] - (SEMVER-MAJOR) fs: add directory autodetection to fsPromises.symlink() (Livia Medeiros) #42894 * [bb4891d] - (SEMVER-MAJOR) fs: add validateBuffer to improve error (Hirotaka Tagawa / wafuwafu13) #44769 * [950a441] - (SEMVER-MAJOR) fs: remove coercion to string in writing methods (Livia Medeiros) #42796 * [41a6d82] - (SEMVER-MAJOR) fs: harden fs.readSync(buffer, options) typecheck (LiviaMedeiros) #42772 * [2275faa] - (SEMVER-MAJOR) fs: harden fs.read(params, callback) typecheck (LiviaMedeiros) #42772 * [29953a0] - (SEMVER-MAJOR) fs: harden filehandle.read(params) typecheck (LiviaMedeiros) #42772 * [4267b92] - (SEMVER-MAJOR) http: use Keep-Alive by default in global agents (Paolo Insogna) #43522 * [f529f73] - (SEMVER-MAJOR) lib: brand check event handler property receivers (Chengzhong Wu) #44483 * [6de2673] - (SEMVER-MAJOR) lib: enable global WebCrypto by default (Antoine du Hamel) #42083 * [73ba883] - (SEMVER-MAJOR) lib: use private field in AbortController (Joyee Cheung) #43820 * [7dd2f41] - (SEMVER-MAJOR) module: runtime deprecate exports double slash maps (Guy Bedford) #44495 * [587367d] - (SEMVER-MAJOR) perf_hooks: expose webperf global scope interfaces (Chengzhong Wu) #44483 * [364c0e1] - (SEMVER-MAJOR) perf_hooks: fix webperf idlharness (Chengzhong Wu) #44483 * [e0ab8dd] - (SEMVER-MAJOR) process: make process.config read only (Sergey Petushkov) #43627 * [481a959] - (SEMVER-MAJOR) readline: remove `question` method from `InterfaceConstructor` (Antoine du Hamel) #44606 * [77e5856] - (SEMVER-MAJOR) src: turn embedder api overload into default argument (Alena Khineika) #43629 * [dabda03] - (SEMVER-MAJOR) src: per-environment time origin value (Chengzhong Wu) #43781 * [2b32985] - (SEMVER-MAJOR) stream: use null for the error argument (Luigi Pinca) #44312 * [57ff476] - (SEMVER-MAJOR) test: remove duplicate test (Luigi Pinca) #44051 * [77def91] - (SEMVER-MAJOR) tls,http2: send fatal alert on ALPN mismatch (Tobias Nießen) #44031 PR-URL: #44626 Co-authored-by: Ruy Adorno <ruyadorno@google.com>

…Early Hints) and other 1XX statuses (dunglas) This PR was squashed before being merged into the 6.3 branch. Discussion ---------- [HttpFoundation] Add support for the 103 status code (Early Hints) and other 1XX statuses | Q | A | ------------- | --- | Branch? | 6.3 | Bug fix? | no | New feature? | yes  | Deprecations? | yes  | Tickets | n/a  | License | MIT | Doc PR | todo This patch adds support for sending informational responses, including [Early Hints responses](https://developer.chrome.com/blog/early-hints/) if supported by the SAPI. It also allows sending other informational status codes such as 102 Processing. According to [Shopify](https://twitter.com/colinbendell/status/1539322190541295616) and [Cloudflare](http://blog.cloudflare.com/early-hints-performance), using Early Hints, the performance improvement to the Largest Contentful Paint can go from several hundred milliseconds, and up to a second faster. Usage: ```php <?php namespace App\Controller; use Symfony\Bundle\FrameworkBundle\Controller\AbstractController; use Symfony\Component\HttpFoundation\Response; use Symfony\Component\Routing\Annotation\Route; use Symfony\Component\WebLink\Link; class HomepageController extends AbstractController { #[Route("/", name: "homepage")] public function index(): Response { $response = $this->sendEarlyHints([ (new Link(href: '/style.css'))->withAttribute('as', 'stylesheet'), (new Link(href: '/script.js'))->withAttribute('as', 'script'), ]); // Do something slow... return $this->render('homepage/index.html.twig', response: $response); } } ``` With this patch, HttpFoundation will leverage the `headers_send()` function provided by [FrankenPHP](https://frankenphp.dev). FrankenPHP is currently the only SAPI supporting Early Hints, but other SAPI such as mod_apache will probably implement this function at some point: php/php-src#7025 (comment) The low-level API is similar to the one provided by Go: golang/go#42597 The high-level API helper in `AbstractController` is similar to Node's one: nodejs/node#44180 Commits ------- 5be52b2 [HttpFoundation] Add support for the 103 status code (Early Hints) and other 1XX statuses

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RafaelGSS mentioned this pull request Sep 13, 2022

2022-10-18, Version 19.0.0 (Current) #44626

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danielroe mentioned this pull request Sep 20, 2022

support 103 Early Hints for renderer unjs/nitro#439

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climba03003 mentioned this pull request Sep 27, 2022

feat!: migrate to fastify org fastify/fastify-early-hints#1

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http: make early hints implementation more generic #44816

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http,http2: make early hints generic #44820

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fishcharlie mentioned this pull request Oct 7, 2022

How to support HTTP 103 Early Hints? expressjs/express#4938

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v18.11.0 proposal #44968

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Added note about NodeJS support for early hints GoogleChrome/developer.chrome.com#4076

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[HttpFoundation] Add support for the 103 status code (Early Hints) and other 1XX statuses symfony/symfony#48128

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Overzealous link header validation in writeEarlyHints #46453

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mcollina commented Oct 6, 2022

http: add writeEarlyHints function to ServerResponse #44180

http: add writeEarlyHints function to ServerResponse #44180

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