We have our service hosted on App Service (Web Apps). And our runners are seeing 404 response status codes intermittently with and HTML page in the response sometimes. However, the requests have not been reaching our service.
From the logs available from App Service, I see thousands of 404s were output none being from the front end. However, on the worker logs I see only 8 of them and these other requests resulting in 404s hadn't reached our service. Attaching images from the logs:
App Service says all 404s resulted from workers
App Service worker handler logs only show 8
The 8 404s we see in the worker logs were actually expected since we'd performed 8 negative tests to verify the 404s.
I'm trying to understand where these other 404s might be coming from. Any insight into why / how this could be happening would be super-helpful. Thanks!