1909271 - www.mapbusinessonline.com - The page refuses to load - h2 priority

Status: RESOLVED DUPLICATE of bug 1909666

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

Description

[Raul Bucata]

Environment:
Operating system: Windows 10
Firefox version: Firefox 128.0

Steps to reproduce:

1. Navigate to: https://www.mapbusinessonline.com
2. Observe

Expected Behavior:
The page loads

Actual Behavior:
Browser does nothing

Notes:

• Reproduces regardless of the status of ETP
• Reproduces in Firefox Nightly, and Firefox Release
• Does not reproduce in Chrome
• Turning off network.http.http2.allow-pus solves the issue

Created from https://github.com/webcompat/web-bugs/issues/139430

Comment 1

[Alice0775 White]

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=750a9d68013bf86f5d1e16ddc95cce396fffd4a2&tochange=deedf27980767ec044741273bc0c9ad212bc4e1d

Comment 2

[Randell Jesup [:jesup] (needinfo me)]

Kershaw, can you take a look?

Comment 3

[Andrew Creskey [:acreskey]]

It looks h2 server push is enabled by default, network.http.http2.allow-push, but this doesn't play well with Extensible Prioritization Scheme for HTTP/2 in bug 1865040.

Comment 4

[Kershaw Chang [:kershaw]]

This bug is caused by bug 1865040, as we disabled sending the HTTP/2 dependency tree to the server. According to RFC 9218, Firefox is not doing anything wrong, but apparently, some servers are not yet compliant with RFC 9218.

I'll dup this bug with bug 1909666 and provide a patch in that bug.

Comment 5

[Valentin Gosu [:valentin] (he/him) {{ PTO until Nov 5 }}]

Attachment: mapsonline_reset_push_with_secrets.pcapng

PCAP for historical purposes.
It turns out the webserver would reset the TCP connection upon receiving a PRIORITY_UPDATE frame for the pushed stream.