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I don't understand why server push is in the standard but not Early Hints.

I saw some articles but seems both server side & client side support are lacking.

(I can be wrong)

At least I don't see early hint in Nginx...

103 Early Hints is RFC 8297. It defines a status code. Because status codes are an HTTP semantic, they are common across all HTTP/1.1, HTTP/2, and HTTP/3. There's nothing special that needs to be done from a specification perspective, early hints _can_ work on any version. Whether implementations support that is a slightly different matter.

FYI early hints support is coming to Go, so it's possible that Caddy will gain support for it in a while (it'll need Caddy to have Go 1.19 as minimum so it's still like about a year or so away probably)

So the golang quic module will need to implement it .

I have been using quic with golang and am looking forward to trying this out

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