[BUG] Chrome and Webkit always return null for postDataBuffer

[weyert]

Context:

• Playwright Version: 1.23.4
• Operating System: Mac
• Node.js version: 18.3.0
• Browser: Webkit, Chromium

System:

• OS: macOS 12.4
• Memory: 99.64 MB / 16.00 GB

Binaries:

• Node: 18.3.0 - ~/.volta/tools/image/node/18.3.0/bin/node
• Yarn: 3.2.1 - ~/.volta/tools/image/yarn/1.22.18/bin/yarn
• npm: 8.13.2 - ~/.volta/tools/image/npm/8.13.2/bin/npm

Languages:

• Bash: 3.2.57 - /bin/bash

Code Snippet

See repro in this repository:
https://github.com/weyert/playwright-request-data-bug

Describe the bug

I am trying to intercept outgoing POST network requests from a third-party analytics company only I am unable to get the raw request data because the request.postDataBuffer-method always returns null in this case

[mxschmitt]

Looks similar to #6479.

[dgozman]

Thank you for the repro! Merging into #6479.