[Bug]: empty URL in IPCMainEvent.senderFrame.url

[bpasero]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

17.x

What operating system are you using?

Windows

Operating System Version

Windows 11

What arch are you using?

arm64 (including Apple Silicon)

Last Known Working Electron version

No response

Expected Behavior

The IPCMainEvent.senderFrame.url should never be the empty string.

Actual Behavior

The IPCMainEvent.senderFrame.url is an empty string.

Testcase Gist URL

No response

Additional Information

Steps to reproduce:

• git clone https://github.com/bpasero/playwright-electron.git
• yarn
• node index.js

Notice how this line throws an error: https://github.com/bpasero/playwright-electron/blob/53d16919a89984f7d889102c69b30679495e337e/main.js#L41

This does not reproduce when not running with playwright so it is probably related.

//cc @deepak1556

[MarshallOfSound]

@bpasero I believe the empty URL actually means the page failed to load and is ending up at chrome-error://chromewebdata/. Basically your custom protocol handler is returning a completely invalid file path and the page is failing to load.

For legacy reasons your preload script will still run on the chrome error page but the URL of that page to most APIs is the empty string.

I fixed up your custom protocol handler in this PR: bpasero/playwright-electron#1

Not sure if your vscode protocol handler has similar issues or not, debugging playwright is kinda tricky I couldn't find an easy way to get main process logs 🤷

[bpasero]

Thanks for the prompt follow up, too bad I was unlucky in finding the issue we see in VSCode and the Windows paths are all wrong.

In VSCode we still see this and it reproduces on macOS too and paths seems to be fine. So I still have to find a way to reproduce this in a minimal sample...

[bpasero]

Btw playwright prints very detailed logs when setting export DEBUG=pw:browser.

[MarshallOfSound]

I'd look for a similar cause, maybe listen to the did-fail-load event and log out any relevant information.