669159 - Restore backup connection for IPv6-only hosts

Status: RESOLVED DUPLICATE of bug 684893

(Core :: Networking: HTTP, defect)

Description

[Christian :Biesinger (don't email me, ping me on IRC)]

See 621558 comment 9 - I've come to the conclusion that this is actually doable without too much difficulty.

Implementation sketch:
- Add an attribute + member variable isIpv6Only to socket transport. default to false (needed when we don't do DNS resolution, e.g. for SOCKS)
- when DNS resolution is done, iterate over the DNS record and store whether it is v6-only
- when the backup connection gets set up, read that property from the main connection to figure out whether to disable v6 or not

Comment 1

[Patrick McManus [:mcmanus]]

see also https://bugzilla.mozilla.org/show_bug.cgi?id=684893

Comment 2

[Christian :Biesinger (don't email me, ping me on IRC)]

may be a duplicate of the bug Patrick mentioned, but either way, I'm not working on this one...