feat: add request.body async getters

[hbenl]

Fixes #38150 and the following tests:

with Chrome/CDP:

• page/network-request-body.spec.ts:
  • "should get request body for file/blob"
  • "should get request body for navigator.sendBeacon api calls"

with BiDi:

• page/network-request-body.spec.ts:
  • "should return correct request body buffer for utf-8 body"
  • "should return request body w/o content-type"
  • "should throw on invalid JSON in post data"
  • "should return body for PUT requests"
  • "should get request body for file/blob"
  • "should get request body for navigator.sendBeacon api calls"

[hbenl]

The failing BiDi tests are all passing locally. CI test results seem flakier than they used to be, perhaps due to the increased number of workers.

[whimboo]

@hbenl mind checking the BiDi job? Two tests are failing - maybe intermittently?

[hbenl]

Those failures are unrelated to this PR, the tests are also failing in other test runs, I've added them to the expectations file.

[whimboo]

Those failures are unrelated to this PR, the tests are also failing in other test runs, I've added them to the expectations file.

Interesting. Do we know since when they started to fail and what caused them given that we were probably green about 4 weeks ago? Or are they new and were not added to the expectation list?

[hbenl]

Interesting. Do we know since when they started to fail and what caused them given that we were probably green about 4 weeks ago? Or are they new and were not added to the expectation list?

One of them is new and has been failing intermittently from the start, the other started failing on 2026-01-09. I'll investigate.

[hbenl]

The 2 failures in the latest run are from new tests that have been failing before (one of them intermittently).

[hbenl]

Hi @yury-s, is there anything holding this PR back from being merged (I did address your review comments)? So far we never merged PRs ourselves, would that be OK once a PR has been approved?

[hbenl]

• rebased
• changed the version for the new feature in the documentation to 1.59
• added 3 more tests to the expectations file

[github-actions]

Test results for "MCP"

12 failed
❌ [webkit] › mcp/snapshot-mode.spec.ts:58 › should respect --snapshot-mode=incremental @mcp-windows-latest
❌ [chrome] › mcp/cli.spec.ts:267 › save as › screenshot --full-page @mcp-macos-15
❌ [chromium] › mcp/cli.spec.ts:162 › core › dialog-accept @mcp-macos-15
❌ [chromium] › mcp/cli.spec.ts:267 › save as › screenshot --full-page @mcp-macos-15
❌ [chromium] › mcp/cli.spec.ts:342 › devtools › tracing-start-stop @mcp-macos-15
❌ [chromium] › mcp/launch.spec.ts:21 › test reopen browser @mcp-macos-15
❌ [firefox] › mcp/cli.spec.ts:267 › save as › screenshot --full-page @mcp-macos-15
❌ [firefox] › mcp/cli.spec.ts:342 › devtools › tracing-start-stop @mcp-macos-15
❌ [webkit] › mcp/cli.spec.ts:267 › save as › screenshot --full-page @mcp-macos-15
❌ [webkit] › mcp/http.spec.ts:263 › http transport shared context @mcp-macos-15
❌ [webkit] › mcp/snapshot-mode.spec.ts:58 › should respect --snapshot-mode=incremental @mcp-macos-15
❌ [webkit] › mcp/test-debug.spec.ts:167 › test_debug (pause/snapshot/resume) @mcp-macos-15

3094 passed, 300 skipped

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Merge workflow run.

[github-actions]

Test results for "tests 1"

10 failed
❌ [playwright-test] › runner.spec.ts:124 › should ignore subprocess creation error because of SIGINT @macos-latest-node20
❌ [playwright-test] › reporter-html.spec.ts:1037 › merged › should have link for opening HTML attachments in new tab @macos-latest-node20
❌ [playwright-test] › test-server.spec.ts:178 › start dev server @macos-latest-node20
❌ [playwright-test] › test-step.spec.ts:115 › should report api step hierarchy @macos-latest-node20
❌ [playwright-test] › test-step.spec.ts:190 › should not report nested after hooks @macos-latest-node20
❌ [playwright-test] › update-aria-snapshot.spec.ts:120 › should update multiple missing snapshots @macos-latest-node20
❌ [playwright-test] › update-aria-snapshot.spec.ts:345 › should update multiple files @macos-latest-node20
❌ [playwright-test] › update-aria-snapshot.spec.ts:461 › should update when options are specified @macos-latest-node20
❌ [playwright-test] › update-aria-snapshot.spec.ts:545 › update-snapshots all › should create new baseline for matching snapshot @macos-latest-node20
❌ [playwright-test] › update-aria-snapshot.spec.ts:592 › update-source-method › should overwrite source @macos-latest-node20

4 flaky

⚠️ [chromium-library] › library/inspector/recorder-api.spec.ts:120 › should type `@chromium-ubuntu-22.04-node24`
⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1082 › cli codegen › should not throw csp directive violation errors `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/permissions.spec.ts:115 › permissions › should trigger permission onchange `@firefox-ubuntu-22.04-node20`
⚠️ [playwright-test] › ui-mode-test-output.spec.ts:118 › should collapse repeated console messages for test `@ubuntu-latest-node22`

34695 passed, 695 skipped

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Merge workflow run.