This sounds like it's simply the HTTP request deadline of the actual client request, and not your application code returning deadline exception errors. The client requests have a default deadline (specific to the library performing the HTTP request) that it will wait for your application to return a response. If your application is too busy/slow the client will give up waiting and time out.
There are a number of things which could be taking up response time (e.g network latency) so it is recommended to ensure your APIs always respond fast. This really comes down to your scaling settings in your app.yaml <https://cloud.google.com/appengine/docs/standard/python/config/appref#scaling_elements> or appengine-web.xml <https://cloud.google.com/appengine/docs/standard/java/config/appref#scaling_elements>, and your actual code. If requests are timing out that means either the requests are waiting too long for available CPU time on an available instance, or your code takes too long to finish and return a response. It is therefore recommended to use the default Automatic scaling settings as these are fine-tuned to provide proper request handling depending on your traffic patterns. You should also avoid slow code initialization times (e.g loading dynamic libraries), and offload all long-running non-client facing work to a different backend service <https://cloud.google.com/appengine/docs/standard/python/microservices-on-app-engine> as this will ensure your front-end client-facing instances are quick to start and always have available CPU to handle requests. Of course you can always increase the client-side request deadline, but this is not always an available option (e.g if the client requests are not in your control). - Note that Google Groups is for general product discussions and not for technical support. If you require further technical support with serving your requests it is recommended to post detailed questions <https://stackoverflow.com/help/how-to-ask> to Stack Overflow <https://cloud.google.com/support/docs/stackexchange> using a supported Cloud tag. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/23176b1a-9911-48aa-900b-cda944eaae9b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
