I send Early Hints headers on my own and getting Error 520

General
1

What is the error number?

520

Here is my headers, tested on localhost / Chrome:

$ curl -k -I -XGET https://localhost/
HTTP/2 103 
link: </images/181/content/v-irkutskom-cheremkhovo-muzhchina.jpg>; rel=preload; as=image
link: </images/180/content/vial-be-predlozhila-lyzhnitse-kuleshovoi.jpg>; rel=preload; as=image
link: </images/179/content/v-ul-ianovskoi-oblasti-obnaruzhen.jpg>; rel=preload; as=image
link: </images/178/content/zenit-interesuetsia-pravym-zashchitnikom.jpg>; rel=preload; as=image

HTTP/2 200 
link: </images/181/content/v-irkutskom-cheremkhovo-muzhchina.jpg>; rel=preload; as=image
link: </images/180/content/vial-be-predlozhila-lyzhnitse-kuleshovoi.jpg>; rel=preload; as=image
link: </images/179/content/v-ul-ianovskoi-oblasti-obnaruzhen.jpg>; rel=preload; as=image
link: </images/178/content/zenit-interesuetsia-pravym-zashchitnikom.jpg>; rel=preload; as=image
content-type: text/html; charset=utf-8
date: Tue, 14 Jan 2025 22:53:18 GMT

But when I remove HTTP/2 103 header from response, Cloudflare adds it by itself and page works. What is the correct way to set Early Hints by my own? Why it’s not possible just to repeat origin’s response?

3

Still a problem

4

Still a problem

5

Still a problem

6

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