[BUG] Incorrect service worker user agent with device emulation

[arjunattam]

Context:

• Playwright Version: 1.8.0
• Operating System: macOS
• Browser: Chromium

When device emulation is used, navigator.userAgent returns different values on page and service worker.

const { chromium, devices } = require('playwright');

(async() => {
  const browser = await chromium.launch({ headless: false });
  const context = await browser.newContext({...devices['Pixel 2']});
  const page = await context.newPage();
  await page.goto('https://googlechrome.github.io/samples/service-worker/basic/');
  console.log(await page.evaluate(() => navigator.userAgent));
  const worker = context.serviceWorkers()[0];
  console.log(await worker.evaluate(() => navigator.userAgent));
  await browser.close();
})();

Actual response

Mozilla/5.0 (Linux; Android 8.0; Pixel 2 Build/OPD3.170816.012) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3765.0 Mobile Safari/537.36
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4392.0 Safari/537.36

Expected: same user agent in both lines

[brnbs]

Is there any update on this?

[SkReD]

Meet this too. With hard refresh user agent in service worker become same as in navigator but even after that with usual refresh user agent in service worker still differs

[jean-francois-labbe]

I'm also facing this issue. Have you found any workaround ?

I wonder how selenium solves this issue as all my serviceWorker tests are working with it.

[Vivek-Kini]

@dgozman : Do we have any updates on this please?

[pavelfeldman]

Why was this issue closed?

Thank you for your contribution to our project. This issue has been closed due to its limited upvotes and recent activity, and insufficient feedback for us to effectively act upon. Our priority is to focus on bugs that reflect higher user engagement and have actionable feedback, to ensure our bug database stays manageable.

Should you feel this closure was in error, please create a new issue and reference this one. We're open to revisiting it given increased support or additional clarity. Your understanding and cooperation are greatly appreciated.

[mxschmitt]

Upstream bug: https://issues.chromium.org/issues/40236995