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103 Early Hints support in NGINX

Posted by elvinefendi 
103 Early Hints support in NGINX
December 10, 2021 03:45PM
HTTP/2 introduced a `push` feature that was supposed to improve page speed by pushing assets to the browser before it even requested it. But this feature never really worked because the server doesn't know what assets the browser already have in cache, so it often end up wastful. Ultimately Chrome recently announced they'll be removing support for it soon ([more context on this](https://evertpot.com/http-2-push-is-dead/)).

Now the new solution to this is 103 Early Hints: https://tools.ietf.org/html/rfc8297

Does NGINX have any plan to add support for 103 Early Hints header in response?

Current NGINX behaviour:

Apparently Nginx doesn't handle these response properly. It works well if I request it directly, but once Nginx is in the middle:

Using HTTP2:
$ curl -i https://early-hints-test.shopifycloud.com/
HTTP/2 103
date: Thu, 03 Dec 2020 15:45:18 GMT
link: https://example.com/script.js; rel=preload; as=script
strict-transport-security: max-age=63072000; includeSubDomains; preload
x-dc: gcp-us-central1

curl: (92) HTTP/2 stream 0 was not closed cleanly: PROTOCOL_ERROR (err 1)

Forcing HTTP/1.1, it kinda works except it buffer the response for 20 seconds:

$ curl --http1.1 -i https://early-hints-test.shopifycloud.com/
HTTP/1.1 103 Early Hints
Date: Thu, 03 Dec 2020 15:38:46 GMT
Connection: keep-alive
Link: https://example.com/script.js; rel=preload; as=script
Strict-Transport-Security: max-age=63072000; includeSubDomains; preload
X-Dc: gcp-us-central1

HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 259
Re: 103 Early Hints support in NGINX
August 29, 2022 12:04PM
Hi! Are there any updates?

Chrome is going to remove support for Server Push in version 106, it's already pretty soon https://developer.chrome.com/blog/removing-push/.
In this case, Early Hints is the only one that allows you to start downloading resources before the server responds.
Re: 103 Early Hints support in NGINX
December 19, 2022 04:57PM
Hi all!

We're laggards now! Crome removed HTTP/2 Server Push support and we lost about 30% page load time!
Pruflink: https://developer.chrome.com/blog/removing-push/

We need 103 Early Hints emergency!
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