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Random failures from Taiwan WPT instance
07-26-2018, 11:56 PM
Post: #2
RE: Random failures from Taiwan WPT instance
No, WPT doesn't proxy the outbound requests. A 503 would be generated by a reverse-proxy somewhere in the path, not at the server itself. If you are using a CDN then it is likely coming from the CDN edge, possibly because it can't reach the origin.

It's also possible that some security layers somewhere in front of the server are filtering/blocking the traffic intermittently intentionally (particularly since it is coming from Google Cloud).

You can capture a tcpdump which will show the 503's coming back from the edge (195.8.215.136 in the case of the test you sent). From the looks of it that's not a CDN edge but may still be a load balancer or security device somewhere upstream of the server logs.
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RE: Random failures from Taiwan WPT instance - pmeenan - 07-26-2018 11:56 PM

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