[Feature] expose CDP network intiator for intercepted requests

[Mattwmaster58]

As far as I can tell, there is no builtin way to access the request initiator with playwright.

This has been a long requested feature of puppeteer and it's only recently been added: https://github.com/puppeteer/puppeteer/issues/1395

There are many use cases for such a feature that of which a few are listed in that issue.

Here's an incomplete demo to get around this limitation. I used some of the code in #10464

import asyncio

from playwright.async_api import async_playwright

def intercept(r):
    print(r["initiator"].get("url", "NOT A URL INITIATOR"))

async def set_interceptor(page):
    # we need to enable the debugger and incrase the callstack depth to get accurate initiator results
    # https://github.com/microsoft/playwright/issues/10464#issuecomment-976569128
    cdp = await page.context.new_cdp_session(page)
    await cdp.send("Network.enable")
    await cdp.send("Debugger.enable")
    await cdp.send("Debugger.setAsyncCallStackDepth", {"maxDepth": 32})
    cdp.on("Network.requestWillBeSent", intercept)

async def run(playwright):
    chromium = playwright.chromium
    browser = await chromium.launch(headless=False)
    page = await browser.new_page()
    await set_interceptor(page)
    await page.goto("https://old.reddit.com/r/videos/comments/wgi7ts/2002_an_unknown_band_called_the_killers_play/")
    await browser.close()


async def main():
    async with async_playwright() as playwright:
        await run(playwright)

asyncio.run(main())

[Mattwmaster58]

Would this be something playwright would take a PR for? Or would the feature still need to be evaluated to be added?