Open Bug 1979683 Opened 8 months ago Updated 3 months ago

cloudflare-quic.com - Firefox uses HTTP/2 instead of HTTP/3 on Cloudflare-hosted sites

Categories

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

Product:
Core
Component:
Networking: HTTP
Platform:
Desktop
macOS
Type:
defect

Tracking

()

Project Flags:
Webcompat Score 1

People

(Reporter: rbucata, Unassigned)

References

(Depends on 1 open bug,
URL
)

Details

(Keywords: webcompat:platform-bug, Whiteboard: [webcompat-source:web-bugs][necko-triaged])

Environment:
Operating system: Mac OS X 10.15.7
Firefox version: Firefox 141.0

Steps to reproduce:

  1. Navigate to: https://cloudflare-quic.com/
  2. Observe the message displayed

Expected Behavior:
Firefox uses HTTP/3

Actual Behavior:
Firefox uses HTTP/2.

Notes:

  • Reproduces regardless of the status of ETP
  • Reproduces in firefox-nightly, and firefox-release
  • Does not reproduce in chrome

Created from https://github.com/webcompat/web-bugs/issues/168913

Webcompat Score: --- → 1

The severity field is not set for this bug.
:denschub, could you have a look please?

For more information, please visit BugBot documentation.

Flags: needinfo?(dschubert)
Severity: -- → S3
Component: Site Reports → Networking: HTTP
Depends on: happy_eyeballs
Flags: needinfo?(dschubert)
Priority: -- → P2
Product: Web Compatibility → Core
Whiteboard: [webcompat-source:web-bugs] → [webcompat-source:web-bugs][necko-triaged]

Per our definition, nothing is broken, so this is not a site report.

Keywords: webcompat:site-report

Raul since you wrote that you can reproduce, can you provide an HTTP log?

https://firefox-source-docs.mozilla.org/networking/http/logging.html

Also could you check whether you have IPv6 connectivity?

https://ipv6test.google.com/

Our current best guess:

  • Firefox will attempt HTTP/3 QUIC via IPv6.
  • IPv6 connectivity fails.
  • Firefox falls back to both IPv4 and TCP.

The above would be fixed by Bug 1953459.

Flags: needinfo?(rbucata)

I can reproduce.

Google reports:

You don’t have IPv6, but you shouldn’t have problems on websites that add IPv6 support.

https://test-ipv6.com/ reports:

No IPv6 address detected. You will not be able to reach IPv6-only sites.

Enabling a VPN with IPv6 support fixes the issue and shows https://cloudflare-quic.com/ loading over HTTP/3.

It works for Windows now, I have IPv6. Both Chrome and Firefox need a refresh to show that is loading over HTTP/3

Flags: needinfo?(rbucata)
Duplicate of this bug: 2000131

I can reproduce that I get HTTP2 on IPv4 only networks and HTTP3 on IPv6+IPv4 networks. Unfortunetly I currently don't have my own server with IPv6 to see if this is cloudflare only.

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