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Intent to unship: HTTP/2 Push

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Valentin Gosu's profile photo

Valentin Gosu

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Sep 4, 2024, 3:44:13 PM (2 days ago) Sep 4



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In the next few days I intend to disable HTTP/2 Push on all
platforms.


Status in other browsers is:

  * Safari: although I couldn't find any resources regarding the
    deprecation of HTTP/2 Push in Safari, local testing with a nodejs
    server indicates that Safari rejects push streams in the current
    version.

  * Chrome: Disabled HTTP/2 push in Chrome 106 (September 2022) 
    Chrome Platform Status


Bug to remove: 1915848 - Pref off HTTP/2 push


Two years ago Chrome disabled HTTP/2 push citing low use, and
recommending the rel="preload" and 103 Early hints as a replacement.
Firefox has continued supporting HTTP/2 push as this wasn't too large
of an effort until recently. However in the past few months we've
encountered some webcompat bugs only affecting Firefox through HTTP/2
push: bug 1915830. This means that if webservers and websites use
push and don't test in Firefox, this feature can potentially cause
websites to stop working only in Firefox (eg bug 1913100)


Though we will pref it off now, the implementation will remain in the
tree for a while longer. Most likely we will remove it completely
before we branch for ESR 140 in the spring of next year.


Please let me know if you have any concerns. Thanks!

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