Cloudflare has introduced Early Hints based on Link Header. I am a little bit confused about how I should send the link header in my PHP script.
As I understand, I should send the Link Header for the links to preconnect
Link: <https://example.com/style.css>; rel="preconnect"
I think we can send HTTP 103 Early Hint via PHP headers
header("Link: <https://example.com/style.css>; rel=preload; as=style", false);
Is it enough?
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Answer
No, you actually are required to put nopush at the end, otherwise you’re doing a Push, or set the status code header.
header("Link: <https://example.com/style.css>; rel=preload; as=style; nopush", false);
This would work.