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[Resource Timing] Add finalResponseHeadersStart and firstInterimResponseStart attributes#55467

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[Resource Timing] Add finalResponseHeadersStart and firstInterimResponseStart attributes#55467
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hjanuschka:feature/resource-timing-impl

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@hjanuschka hjanuschka commented Dec 16, 2025 •
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[Resource Timing] Add finalResponseHeadersStart and firstInterimResponseStart attributes
https://bugs.webkit.org/show_bug.cgi?id=304235

Reviewed by Alex Christensen.

Implement W3C Resource Timing Level 3 attributes for distinguishing interim (1xx) and final
response timing. This enables proper measurement of HTTP 103 Early Hints and other informational
responses. Timestamps are captured via NSURLSession delegate callbacks without requiring CFNetwork changes.

* Source/WebCore/page/PerformanceResourceTiming.cpp:
(WebCore::PerformanceResourceTiming::finalResponseHeadersStart const): Added.
(WebCore::PerformanceResourceTiming::firstInterimResponseStart const): Added.
(WebCore::PerformanceResourceTiming::responseStart const): Updated to return interim if present.
* Source/WebCore/page/PerformanceResourceTiming.h:
* Source/WebCore/page/PerformanceResourceTiming.idl:
* Source/WebCore/platform/network/NetworkLoadMetrics.cpp:
(WebCore::NetworkLoadMetrics::updateFromFinalMetrics):
(WebCore::NetworkLoadMetrics::isolatedCopy const):
* Source/WebCore/platform/network/NetworkLoadMetrics.h:
* Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm:
(-[WKNetworkSessionDelegate URLSession:task:didReceiveInformationalResponse:]):
(-[WKNetworkSessionDelegate URLSession:dataTask:didReceiveResponse:completionHandler:]):
* Source/WebKit/Shared/WebCoreArgumentCoders.serialization.in:
* LayoutTests/imported/w3c/web-platform-tests/resource-timing/idlharness.any-expected.txt: Updated expectations.
* LayoutTests/imported/w3c/web-platform-tests/resource-timing/idlharness.any.worker-expected.txt: Updated expectations.

Add soup/glib support for interim response timing

Implement firstInterimResponseStart and finalResponseHeadersStart capture
for Linux/GTK/WPE platforms using libsoup's got-headers signal.

The got-headers callback is invoked for all HTTP responses including
informational (1xx) responses, allowing us to distinguish and capture
timing for both interim and final responses.

Add Helmut Januschka to contributors

Canonical link: https://commits.webkit.org/304905@main

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✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 webkitpy ✅ 🧪 ios-wk2-wpt ✅ 🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
✅ 🧪 api-ios ✅ 🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision ✅ 🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 🧪 unsafe-merge ✅ 🛠 tv ✅ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
✅ 🛠 watch-sim

@hjanuschka hjanuschka requested a review from cdumez as a code owner December 16, 2025 09:23
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✅ 🧪 webkitperl ✅ 🧪 ios-wk2   🧪 api-mac ✅ 🧪 api-wpe
⏳ 🧪 ios-wk2-wpt   🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
  🧪 api-ios   🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision   🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim   🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress ⏳ 🛠 playstation
✅ 🛠 tv ⏳ 🧪 mac-intel-wk2 ⏳ 🛠 jsc-armv7
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp ⏳ 🧪 jsc-armv7-tests
✅ 🛠 watch
✅ 🛠 watch-sim

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@hjanuschka hjanuschka force-pushed the feature/resource-timing-impl branch from c4f21c9 to e26cf96 Compare December 16, 2025 10:42
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✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
  🧪 ios-wk2-wpt ✅ 🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
✅ 🧪 api-ios ❌ 🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision ❌ 🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ❌ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv ❌ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
✅ 🛠 watch-sim

@hjanuschka hjanuschka requested a review from a team as a code owner December 16, 2025 16:28
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✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
⏳ 🧪 ios-wk2-wpt ✅ 🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
✅ 🧪 api-ios   🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision   🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim   🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv   🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
✅ 🛠 watch-sim

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✅ 🛠 vision ❌ 🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ❌ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv ❌ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
✅ 🛠 watch-sim

@hjanuschka hjanuschka force-pushed the feature/resource-timing-impl branch from d5404d1 to 41d54fc Compare December 16, 2025 22:53
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✅ 🧪 webkitpy ❌ 🧪 ios-wk2-wpt ❌ 🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
✅ 🧪 api-ios ✅ 🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision ❌ 🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ❌ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv ❌ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
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achristensen07 commented Dec 19, 2025

This seems fine so I approved it, but it looks like worker-performance.worker-expected.txt needs updating too

@hjanuschka hjanuschka force-pushed the feature/resource-timing-impl branch from 41d54fc to 9f60c12 Compare December 20, 2025 22:41
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❌ 🧪 webkitperl ❌ 🧪 ios-wk2 ❌ 🧪 api-mac   🧪 api-wpe
❌ 🧪 webkitpy ❌ 🧪 ios-wk2-wpt ❌ 🧪 api-mac-debug   🛠 wpe-cairo-libwebrtc
❌ 🧪 api-ios ❌ 🧪 mac-wk1   🛠 gtk
❌ 🛠 vision ❌ 🧪 mac-wk2   🧪 gtk-wk2
❌ 🛠 vision-sim ❌ 🧪 mac-AS-debug-wk2   🧪 api-gtk
⏳ 🧪 vision-wk2 ❌ 🧪 mac-wk2-stress ❌ 🛠 playstation
❌ 🛠 tv ❌ 🧪 mac-intel-wk2
❌ 🛠 tv-sim ❌ 🛠 mac-safer-cpp
❌ 🛠 watch
❌ 🛠 watch-sim

@hjanuschka hjanuschka force-pushed the feature/resource-timing-impl branch from 9f60c12 to 6eb0a1a Compare December 20, 2025 22:45
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✅ 🧪 webkitperl   🧪 ios-wk2   🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 webkitpy   🧪 ios-wk2-wpt   🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
✅ 🧪 api-ios   🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision   🧪 mac-wk2   🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv ✅ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
✅ 🛠 watch-sim

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hjanuschka commented Dec 20, 2025

@achristensen07 thx, feedback addressed

@hjanuschka hjanuschka force-pushed the feature/resource-timing-impl branch from 6eb0a1a to f3f4d71 Compare December 21, 2025 00:05
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✅ 🧪 bindings ❌ 🛠 ios-sim ✅ 🛠 mac-AS-debug ❌ 🧪 wpe-wk2 ⏳ 🧪 win-tests
✅ 🧪 webkitperl ❌ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 webkitpy ❌ 🧪 ios-wk2-wpt ✅ 🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
❌ 🧪 api-ios ✅ 🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision ✅ 🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv ✅ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
✅ 🛠 watch-sim

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✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 webkitpy ✅ 🧪 ios-wk2-wpt ✅ 🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
✅ 🧪 api-ios ❌ 🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision ✅ 🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv ✅ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
✅ 🛠 watch-sim

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✅ 🧪 webkitperl   🧪 ios-wk2   🧪 api-mac   🧪 api-wpe
✅ 🧪 webkitpy   🧪 ios-wk2-wpt   🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
  🧪 api-ios   🧪 mac-wk1   🛠 gtk
✅ 🛠 vision   🧪 mac-wk2   🧪 gtk-wk2
✅ 🛠 vision-sim   🧪 mac-AS-debug-wk2   🧪 api-gtk
✅ 🧪 vision-wk2   🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv   🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
✅ 🛠 watch-sim

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✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 webkitpy ❌ 🧪 ios-wk2-wpt ✅ 🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
✅ 🧪 api-ios ✅ 🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision ✅ 🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv ✅ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
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✅ 🧪 webkitperl   🧪 ios-wk2   🧪 api-mac   🧪 api-wpe
✅ 🧪 webkitpy   🧪 ios-wk2-wpt ⏳ 🧪 api-mac-debug   🛠 wpe-cairo-libwebrtc
  🧪 api-ios   🧪 mac-wk1   🛠 gtk
  🛠 vision   🧪 mac-wk2   🧪 gtk-wk2
✅ 🛠 vision-sim   🧪 mac-AS-debug-wk2   🧪 api-gtk
  🧪 vision-wk2   🧪 mac-wk2-stress   🛠 playstation
  🛠 tv   🧪 mac-intel-wk2
  🛠 tv-sim ✅ 🛠 mac-safer-cpp
  🛠 watch
  🛠 watch-sim

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✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug ❌ 🧪 wpe-wk2 ⏳ 🧪 win-tests
✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 webkitpy   🧪 ios-wk2-wpt ✅ 🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
  🧪 api-ios ✅ 🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision ✅ 🧪 mac-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv ✅ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
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✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug ❌ 🧪 wpe-wk2 ⏳ 🧪 win-tests
✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 webkitpy ❌ 🧪 ios-wk2-wpt ✅ 🧪 api-mac-debug ✅ 🛠 wpe-cairo-libwebrtc
✅ 🧪 api-ios ❌ 🧪 mac-wk1 ✅ 🛠 gtk
✅ 🛠 vision ✅ 🧪 mac-wk2 ✅ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-wk2-stress   🛠 playstation
✅ 🛠 tv ✅ 🧪 mac-intel-wk2
✅ 🛠 tv-sim ✅ 🛠 mac-safer-cpp
✅ 🛠 watch
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@achristensen07 achristensen07 added safe-merge-queue Applied to automatically send a pull-request to merge-queue after passing EWS checks and removed merging-blocked Applied to prevent a change from being merged labels Dec 22, 2025
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Safe-Merge-Queue: Build #78781.

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This change contains multiple commits which are not squashed together, blocking PR #55467. Please squash the commits to land.

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@hjanuschka hjanuschka force-pushed the feature/resource-timing-impl branch from bb094c1 to 55c8dfe Compare December 23, 2025 06:43
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@achristensen07 achristensen07 added unsafe-merge-queue Applied to send a pull request to merge-queue, but skip building and testing and removed merging-blocked Applied to prevent a change from being merged labels Dec 23, 2025
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[Resource Timing] Add finalResponseHeadersStart and firstInterimRespo…
68d1baf 
…nseStart attributes

https://bugs.webkit.org/show_bug.cgi?id=304235

Reviewed by Alex Christensen.

Implement W3C Resource Timing Level 3 attributes for distinguishing interim (1xx) and final
response timing. This enables proper measurement of HTTP 103 Early Hints and other informational
responses. Timestamps are captured via NSURLSession delegate callbacks without requiring CFNetwork changes.

* Source/WebCore/page/PerformanceResourceTiming.cpp:
(WebCore::PerformanceResourceTiming::finalResponseHeadersStart const): Added.
(WebCore::PerformanceResourceTiming::firstInterimResponseStart const): Added.
(WebCore::PerformanceResourceTiming::responseStart const): Updated to return interim if present.
* Source/WebCore/page/PerformanceResourceTiming.h:
* Source/WebCore/page/PerformanceResourceTiming.idl:
* Source/WebCore/platform/network/NetworkLoadMetrics.cpp:
(WebCore::NetworkLoadMetrics::updateFromFinalMetrics):
(WebCore::NetworkLoadMetrics::isolatedCopy const):
* Source/WebCore/platform/network/NetworkLoadMetrics.h:
* Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm:
(-[WKNetworkSessionDelegate URLSession:task:didReceiveInformationalResponse:]):
(-[WKNetworkSessionDelegate URLSession:dataTask:didReceiveResponse:completionHandler:]):
* Source/WebKit/Shared/WebCoreArgumentCoders.serialization.in:
* LayoutTests/imported/w3c/web-platform-tests/resource-timing/idlharness.any-expected.txt: Updated expectations.
* LayoutTests/imported/w3c/web-platform-tests/resource-timing/idlharness.any.worker-expected.txt: Updated expectations.

Add soup/glib support for interim response timing

Implement firstInterimResponseStart and finalResponseHeadersStart capture
for Linux/GTK/WPE platforms using libsoup's got-headers signal.

The got-headers callback is invoked for all HTTP responses including
informational (1xx) responses, allowing us to distinguish and capture
timing for both interim and final responses.

Add Helmut Januschka to contributors

Canonical link: https://commits.webkit.org/304905@main
@webkit-commit-queue webkit-commit-queue force-pushed the feature/resource-timing-impl branch from 55c8dfe to 68d1baf Compare December 23, 2025 17:27
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Committed 304905@main (68d1baf): https://commits.webkit.org/304905@main

Reviewed commits have been landed. Closing PR #55467 and removing active labels.

@webkit-commit-queue webkit-commit-queue merged commit 68d1baf into WebKit:main Dec 23, 2025
@webkit-commit-queue webkit-commit-queue removed the unsafe-merge-queue Applied to send a pull request to merge-queue, but skip building and testing label Dec 23, 2025
@Elchi3 Elchi3 mentioned this pull request Feb 17, 2026
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@achristensen07 achristensen07 achristensen07 approved these changes

@cdumez cdumez Awaiting requested review from cdumez cdumez is a code owner

@JonWBedard JonWBedard Awaiting requested review from JonWBedard JonWBedard is a code owner

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