Open deeringc opened 5 years ago
Does netsh interface ipv6 set prefixpolicy
help here?
Thanks for the good suggestion, @garethsb-sony. It works around the problem but it's not something we can set globally on the user's system. We need something that only affects the app in question.
We're observing an issue where the WinHTTP-based client inside of cpprestsdk is having issues where a users DNS server is returning a mix of IPv6 & IPv4 addresses on a badly configured network.
If the IPv6 address is not routable we see a 21 second timeout , and then WinHTTP seems to fall back on the IPv4 address (which succeeds immediately).
This seems to indicate that WinHTTP does not support Happy Eyeballs (rfc6555).
Can you confirm whether this is indeed the case? Do consumers have any way to control which DNS results are honoured?
Obviously the network is the source of the issue, and that should be addressed, but users mostly dont have any control over this, and many HTTP stacks do support Happy Eyeballs in order to shield users from this.
Thanks, Chris