Description
Version
1.47
Steps to reproduce
server for serving HTML (doesn't matter how, just an example):
from flask import Flask
app = Flask(__name__)
@app.route('/')
def index():
return '''
<!DOCTYPE html>
<html>
<script>
fetch('https://httpbin.org/status/204');
</script>
</html>
'''
if __name__ == '__main__':
app.run(debug=True, port=5001)
repro:
import asyncio
from playwright.async_api import async_playwright
async def main():
async with async_playwright() as p:
browser = await p.chromium.launch()
page = await browser.new_page()
def catch_request_failure(s):
print(s.url, " failed ", s.failure)
page.on("requestfailed", catch_request_failure)
await page.goto("http://127.0.0.1:5001", wait_until="networkidle")
asyncio.run(main())
Expected behavior
No output from the script. There are no requests that have failed.
Actual behavior
https://httpbin.org/status/204 failed net::ERR_ABORTED
This isn't true, the request succeeded. If you run with launch(devtools=True) then you can see the very request in the devtools and that it did succeed.
Additional context
However, this time I think it's different as instead of talking about a Page.goto call, it's a request initiated by the page. There was justification in #31570 that a failure of navigation could be technically correct as no navigation takes place, but for a request initiated by a page, I do not think that a requestfailed event is correct.
In my use case, I monitor the requests that a site makes on load for privacy assessment. It's important to know whether a request was actually made or whether it happened to failed.