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[Bug]: response.allHeaders() hangs for Worker script loaded inside an iframe (Chromium only) #39948
Description
Version
1.58.2
Steps to reproduce
Reproduction is also available in https://try.playwright.tech/?l=javascript&s=m9zi4si
- Clone the repo:
git clone https://github.com/adi-benz/playwright-ww-iframe-hang-bug.git npm installnpx playwright install chromiumnode repro.js- Observe that
response.allHeaders()hangs indefinitely on the/worker.jsrequest
The bug requires the combination of an iframe + Web Worker
Expected behavior
I expect the call to response.allHeaders() on line 38 to return the headers, but it's stuck indefinitely.
I expect to be able to read the headers after I get a callback from page.on('requestfinished').
I noticed that to reproduce this bug there needs to be a combination of an iframe + Web Worker, two additional scripts are provided in the Git repo to show that:
working-no-iframe.js- same setup but Worker is created in the main page (no iframe) → no hang (https://try.playwright.tech/?l=javascript&s=br8eaks)working-firefox.js- same setup but using Firefox instead of Chromium → no hang
Actual behavior
The call to response.allHeaders() hangs on Chromium, output shows:
HUNG after 5s on: http://localhost:39145/worker.js
ERROR: response.allHeaders: Target page, context or browser has been closed
Additional context
No response
Environment
System:
OS: macOS 26.4
CPU: (16) arm64 Apple M4 Max
Memory: 644.53 MB / 64.00 GB
Binaries:
Node: 25.8.1 - /opt/homebrew/bin/node
npm: 11.11.0 - /opt/homebrew/bin/npm
pnpm: 10.33.0 - /opt/homebrew/bin/pnpm
IDEs:
Claude Code: 2.1.72 - /opt/homebrew/bin/claude
opencode: 1.3.0 - /opt/homebrew/bin/opencode
Languages:
Bash: 5.3.3 - /opt/homebrew/bin/bash
npmPackages:
playwright: ^1.58.2 => 1.58.2
Activity
Skn0tt commentedon Mar 31, 2026
This regressed in #34400, so it seems similar to #35678. Dmitry Gozman (@dgozman) could you take a look?
scarab-systems commentedon Jun 10, 2026
Thanks for the report and for the pointer to the PlzDedicatedWorker regression path. I reproduced this locally on macOS arm64 against current
mainand have a small patch that keeps the existing extra-info behavior for normal requests, but falls back to provisional raw headers when a worker-main-script request finishes in a worker-frame session without matching extra-info events.Local validation:
npm run ctest -- tests/page/workers.spec.ts --workers=1 --reporter=linenpm run ctest -- tests/page/page-network-response.spec.ts --workers=1 --reporter=linenpm run lintI noticed the contribution policy asks contributors to wait for assignment or explicit community approval before opening a PR, so I’ll wait rather than open one unsolicited. Happy to send the patch if maintainers want it.
dgozman commentedon Jun 25, 2026
Upstream fix: https://chromium-review.googlesource.com/c/chromium/src/+/8003476
scarab-systems commentedon Jun 25, 2026
Thanks, that makes sense. I’ll stand down on the Playwright-side patch and watch for the Chromium fix to flow through.