We intent to enable Early Hints Preload in Fx123. Early Hints is the
informational status code 103, allowing servers to send resource Link
headers before the final HTTP response. An experiment on Early Hints
preload and modulepreload headers in Early Hints responses ran in
release version 121 with overall positive results. Link headers with
relation "rel=preload" with asset types "fetch", "font", "image",
"script", "stylesheet", or relation "rel=modulepreload" are preloaded.
Bug: https://bugzil.la/1874445
Standard:
- https://html.spec.whatwg.org/multipage/semantics.html#early-hints
<https://html.spec.whatwg.org/multipage/semantics.html#early-hints>
- https://www.rfc-editor.org/rfc/rfc8297
<https://www.rfc-editor.org/rfc/rfc8297>
Platform coverage: all
Preference: Early Hints Preload and Modulepreload is behind the pref
"network.early-hints.enabled". When set to true preload requests are
made as soon as the Early Hints reply arrive.
Other Browsers:
- Blink: Shipped in 103
Demo: Test website simulating the effect of Early Hints Preload with an
artificial delay between 103 and 200 responses:
https://lab.neon.rocks/1000/eh/images-100.html
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