We intend to enable Early Hints Preconnect in Fx120. Early Hints is the
informational status code 103, allowing servers to send resource Link
headers before the final HTTP response. An experiment on preconnect
headers in Early Hints responses ran in release version 117 and 118 with
overall positive results.
Bug: https://bugzil.la/1858712
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 Preconnect feature is behind the pref
"network.early-hints.preconnect.enabled". When set to true, we initiate
the TLS handshake to resources specified by the link header in the Early
Hints response by the server.
Intent-to-prototype:
https://groups.google.com/a/mozilla.org/g/dev-platform/c/GNp44ffmGGs
Other Browsers:
- Blink: Shipped in 103
- Webkit: Shipped in 17
Demo: Test websites simulating the effect of Early Hints Preconnect with
an artificially delay between 103 and 200 responses:
- preconnect (IPv6 only):
https://lab.neon.rocks/1000/eh/images-preconnect-100.html
<https://lab.neon.rocks/1000/eh/images-preconnect-100.html>
- preconnect (less visible impact):
https://lab.neon.rocks/1000/eh/images-preconnect.html
<https://lab.neon.rocks/1000/eh/images-preconnect.html>
Web-platform-tests: https://wpt.fyi/results/loading/early-hints
<https://wpt.fyi/results/loading/early-hints>
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