| Peter | |
| Dec 1 2018, 7:48 AM |
| F27343539: Compare HAR files.png | |
| Dec 1 2018, 7:48 AM |
We get a 404 for one of the request when testing on mobile:
I think it must be that the request isn't happening before we close down the recording step (that should be at least +2 after onload).
Looking at our WebPageTest runs, it seems that we end the tests too early (we have less requests here):
http://wpt.wmftest.org/result/181201_K7_54/1/details/#waterfall_view_step1
Re-opening because I still this on some pages: https://s3.amazonaws.com/synthetic-tests-result-wikimedia/ar.m.wikipedia.org/2019-11-25-10-46-36/pages/ar.m.wikipedia.org/wiki/---------/index.html#waterfall
I've been trying to fix this again. I can see that we record 24 requests for the Facebook page on mobile but replay 26. So something is wrong.
I think the problem is images served as image/webp - yep, I'm pretty sure that's the problem.
My guess is that we somehow uses different configs when we record and replay for the browser. But I haven't been able to nail down the problem + it seems an old issue is back. A couple of years ago emulated mode started to resize the screen size in Chrome just before the load ended (I'll need to find that issue) and when I tried now with different device emulations, I could see that again :(