BUG: browser rendering browser.close() hangs

[threepointone]

What versions & operating system are you using?

wrangler@4.24.3, @cloudflare/vite-plugin@1.9.4

Please provide a link to a minimal reproduction

https://github.com/threepointone/browser-close-hangs

Describe the Bug

Like it says, browser.close() hangs in dev, in both vite and wrangler. It works fine in production, but this is a blocker for dev.

   const browser = await launch(env.browser);
    const page = await browser.newPage();
    await page.goto("https://www.example.com");
    const content = await page.content();
    // this line hangs
    await browser.close();   

Please provide any relevant error logs

No response

[ruifigueira]

Debugging it, it gets stuck waiting for a disconnect event which is never triggered:

https://github.com/cloudflare/playwright/blob/81e76bca0b5657530974033d8c66d8aeb8ec72a7/packages/playwright-core/src/server/browser.ts#L181

I'm investigating why that event is not triggered in local dev (with wrangler dev --remote it's properly triggered).

[ruifigueira]

In remote dev, websocket close event is properly triggered, and in local dev it's not. It may be related with this issue I reported to the workerd team:

cloudflare/workerd#4327

[threepointone]

thanks for checking this out! it's blocking our investigations into using it for agents stuff