why the method page.on('request') can't intercept fetch request

[zhaobingss]

why the method page.on('request') can't intercept fetch request like this:

any one help

[LeMoussel]

Do you test with page.setRequestInterception() to intercept request?

Example :

const puppeteer = require('puppeteer');

(async() => {
const browser = await puppeteer.launch();
const page = await browser.newPage()
await page.setRequestInterception(true)
page.on('request', interceptedRequest => {
  // Do some stuff ...

  interceptedRequest.continue()
})

await page.goto('https://example.org/')

browser.close();
})();

[zhaobingss]

@LeMoussel yes of course, other request is no problem except fetch

[aslushnikov]

@zhaobingss fetch requests are intercepted just fine - when they come from the main page.

We don't yet surface network traffic from webworkers though; see #2781. And given the initiators on your screenshot, these fetches are coming from web workers.

(closing as a dupe of the workers network bug).