1882018 - QUIC (HTTP/3) connection does not work when using SOCKS5 proxy

Status: RESOLVED DUPLICATE of bug 1808692

(Core :: Networking: HTTP, defect)

Description

[Konstantin]

Steps to reproduce:

Hello.
FreeBSD 13.2
Firefox 121.0.1

In Firefox settings I set it to use SOCKS5 proxy.
I open a website using the QUIC protocol (HTTP/3).
For example https://quic.nginx.org/quic.html
On this page, you can click on the RUN button to run the HTTP/3 inspection test.

Actual results:

The site opens using HTTP/2 protocol, instead of HTTP/3.

Expected results:

The site must open using the HTTP/3 protocol.

If you turn off SOCKS5, then everything works correctly.
Strange. QUIC is just an add-on over UDP, just like HTTP is over TCP.
And Socks5 supports TCP and UDP. In theory it should work.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Networking: HTTP' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[erosman [:erosman]]

Note:
Chrome already supports QUIC proxy scheme.

See also:
https://searchfox.org/mozilla-central/rev/1aaacaeb4fa3aca6837ecc157e43e947229ba8ce/netwerk/protocol/http/HttpBaseChannel.cpp#6229

Comment 3

[Valentin Gosu [:valentin] (he/him)]

This is because our SOCKS proxy layer does not support UDP traffic.