Starting in Firefox 154, I intend to enable the No-Vary-Search HTTP Caching
Extension by default on all platforms. It has been enabled in nightly since
https://bugzilla.mozilla.org/show_bug.cgi?id=2038012.

This feature was previously discussed in this Intent to prototype thread:
https://groups.google.com/a/mozilla.org/g/dev-platform/c/9FyV3uZk184

Bug to turn on by default:

https://bugzilla.mozilla.org/show_bug.cgi?id=2038013

Standard:
https://httpwg.org/http-extensions/draft-ietf-httpbis-no-vary-search.html

Standards Body:
IETF (httpbis)

Platform Coverage:
All

Preference:
network.cache.no_vary_search

DevTools Bug:
N/A

Extensions Bug:
N/A

Use Counter:
network.no_vary_search_header_received

Standards-Positions Discussion:
https://github.com/mozilla/standards-positions/issues/717 (Positive)

Other Browsers:
Blink: Shipped (Chrome 121 for speculation rules prefetch cache; Chrome 141
for general HTTP disk cache)
WebKit: No position (
https://github.com/WebKit/standards-positions/issues/106)

web-platform-tests:
https://wpt.fyi/results/?label=master&label=experimental&aligned&q=no-vary-search
Regards
Sunil

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