Whilst using App Engine Flex in the *australia-southeast1* region, I’ve noticed a significant degradation in *latency* when I try to hit my services through configured custom domains.
For example, average latency for requests between the two might look like: https://[MY_APP].appspot.com/[SOME_ENDPOINT] = 30ms https://[MY_CUSTOM_DOMAIN]/[SOME_ENDPOINT] = 500ms The later is not really an acceptable average for my users - it really impacts their user experience - so for the meantime, I’ve reverted to using the appspot domain. I can confirm that regardless which URL I use, the server itself processes the requests in the same average time. So I suppose my question is - Why? Why is there so much latency introduced when using custom domains? My theory is that it has something to do with the DNS A Records that app engine requests you to use for the custom domain. When trying to ping them I get the following results: PING 216.239.32.21 (216.239.32.21): 56 data bytes 64 bytes from 216.239.32.21: icmp_seq=0 ttl=44 time=138.100 ms 64 bytes from 216.239.32.21: icmp_seq=1 ttl=44 time=137.941 ms 64 bytes from 216.239.32.21: icmp_seq=2 ttl=44 time=138.883 ms 64 bytes from 216.239.32.21: icmp_seq=3 ttl=44 time=140.659 ms 64 bytes from 216.239.32.21: icmp_seq=4 ttl=44 time=137.879 ms 64 bytes from 216.239.32.21: icmp_seq=5 ttl=44 time=172.411 ms 64 bytes from 216.239.32.21: icmp_seq=6 ttl=44 time=167.350 ms -- 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 [email protected]. To post to this group, send email to [email protected]. 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/67ac51bc-2a87-4824-b7c4-06f81168fd76%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
