It seems that outbound IPv6 requests are either extremely slow to connect (10s+) or fail to connect entirely. I found this by debugging extremely slow outbound requests in my app and was able to isolated it via curl:
This hangs indefinitely:
curl --ipv6 https://google.com
Whereas this returns immediately:
curl --ipv4 https://google.com
I’ve verified the same issues in my Python app by logging the HTTP module and forcibly disabling ipv6.
This happens in the two regions I have my app running:
The only thing in my app that’s changed recently is I added multiple processes. I’m also using the latest pre-release version of
litefs to support write forwarding. Seems unlikely that either of these would effect outbound TCP connections.