Support for Preconnect/Preload and 103 Early Hints

[markllego]

Is your feature request related to a problem? Please describe.
WP-Rocket should upgrade the DNS prefetching to preconnect and preload in order to utilize the 103 Early Hints.

Describe the solution you'd like
Early Hints enable browsers to start preload before the main response is served. In addition, this can be used with other Resource Hints APIs like preconnect.

Link: https://chromium.googlesource.com/chromium/src/+/refs/heads/main/docs/early-hints.md

This will dramatically improve page load times and user experience.

Additional context

Example response header:
Link: https://example.com; rel=preconnect, https://example.com; rel=preconnect; crossorigin, https://example.com/wp-content/themes/theme.css; rel=preload, as=style;

[TokyoJump]

I fully agree with you. This is a big problem.

#801
As he predicted, this is a problem.

CloudFlare provided Early HInts as a means of optimization, but in many cases it's not possible to add it.
This is because currently users cannot add Link headers from function.php.

[rayrutjes]

Hey there,

Anybody has a workaround so we can start using Early Hints with WP-Rocket?

[vipiny35]

Any update here, been waiting for too long now.

[joaodath]

Hey, WP-Rocket team! I was wondering if there are any updates to this feature request. It has the potential to improve loading times for many websites and I would love to see it land on the plugin soon <3

[BradFD]

W3 Total Cache adds link: rel=preload headers for its minified javascript files. How about adding similar to WP Rocket?

They look like:
Link: </wp-content/cache/minify/r3e0dsj.js?x38494>; rel=preload; as=script