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fix(mcp): support remoteHeaders for remote browser endpoint#40828

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yury-s merged 2 commits into
microsoft:mainfrom
yury-s:fix-40814
May 13, 2026
Merged

fix(mcp): support remoteHeaders for remote browser endpoint#40828
yury-s merged 2 commits into
microsoft:mainfrom
yury-s:fix-40814

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@yury-s yury-s commented May 13, 2026

Summary

  • Adds browser.remoteHeaders config option (and --remote-header CLI flag / PLAYWRIGHT_MCP_REMOTE_HEADERS env var) to forward custom headers when MCP/CLI connects to a Playwright run-server endpoint.
  • Lets the client send x-playwright-browser so the remote can select a browser type, fixing the Cannot read properties of undefined (reading 'launch') failure.

Fixes #40814

yury-s added 2 commits May 13, 2026 14:50
@yury-s
fix(mcp): support remoteHeaders for remote browser endpoint
e051af1 
Allows the MCP/CLI client to forward custom headers (e.g.
`x-playwright-browser`) when connecting to a Playwright `run-server`
endpoint, which previously failed because no browser type was
specified.

Fixes: microsoft#40814
@yury-s
test(mcp): skip remote-endpoint tests on non-chromium projects
5c69182 
Remote server connection is browser-agnostic, so running the same test
against every mcpBrowser project just burns CI time.
@yury-s yury-s merged commit c0bcc84 into microsoft:main May 13, 2026
14 of 17 checks passed
@yury-s yury-s deleted the fix-40814 branch May 13, 2026 22:24
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github-actions Bot commented May 13, 2026

Test results for "MCP"

6 failed
❌ [chrome] › mcp/annotate.spec.ts:57 › should capture multiple screenshots in one annotation @mcp-windows-latest-chrome
❌ [chrome] › mcp/annotate.spec.ts:367 › should cancel browser_annotate when the MCP request is aborted @mcp-windows-latest-chrome
❌ [chromium] › mcp/annotate.spec.ts:297 › should annotate via direct browser_annotate MCP call @mcp-windows-latest-chromium
❌ [webkit] › mcp/annotate.spec.ts:137 › should abort MCP annotation when last screenshot is removed @mcp-windows-latest-webkit
❌ [webkit] › mcp/annotate.spec.ts:273 › should enter annotate mode on fresh dashboard.tsx mount with -s --annotate @mcp-windows-latest-webkit
❌ [webkit] › mcp/annotate.spec.ts:367 › should cancel browser_annotate when the MCP request is aborted @mcp-windows-latest-webkit

7080 passed, 1104 skipped

Merge workflow run.

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@pavelfeldman pavelfeldman pavelfeldman approved these changes

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Successfully merging this pull request may close these issues.

playwright-cli remoteEndpoint does not forward browserName to run-server

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