1724240 - If ECH is enabled and IPv6 not accessible HTTP/3 does not fallback to IPv4

Status: RESOLVED FIXED

(Core :: Networking: HTTP, defect, P2)

Description

[Dragana Damjanovic [:dragana]]

This is originally reported in bug 1700703 comment #35

Comment 1

[Dragana Damjanovic [:dragana]]

Description what is happening:

• HTTPS RR record is use and there is entry for HTTP/3
• Firefox tries to connect to HTTP/3 over an IPv6 address but there is no IPv6 connectivity and no packet is received
• the HTTP/3 fallback timer fires and Firefox try to connect to the same server over TCP also using IPv6
• Normally here is a backup timer in case IPv6 does not work and Firefox needs to try IPv4, but in this case it is not set because the backup connection is a speculative connection :(

The solution is to setup the IPv4 backup timer if the connection is a fallback connection.

I will create a patch for this.

Comment 2

[Dragana Damjanovic [:dragana]]

Attachment: Setup fallback timer if a speculative connection is created for a fallback

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/47c413c03555
Setup fallback timer if a speculative connection is created for a fallback r=necko-reviewers,valentin

Comment 4

[Cristian Brindusan [:cbrindusan]]

https://hg.mozilla.org/mozilla-central/rev/47c413c03555