HTTP 2 proxy request protocol

[ignatevdev]

I am trying to ensure that HTTP 2 requests are not downgraded on reverse proxy and currently see that every request going through kamal-proxy is received with HTTP/1.1 protocol on the final endpoint.

Is kamal-proxy designed to support HTTP 2 forwarding and I am doing something wrong or it is not currently supported?

Specifically I am interested only in h2c as I don't need to enable tls on my service.
Thanks in advance!

[kevinmcconnell]

HTTP/2 forwarding is not supported at the moment. But we should probably add support for it, both for h2c and HTTP to the origin. I'll take a closer look at adding this.

I think a good way to incorporate this would be to use explicit schemes in the target URLs. So you could do the following:

URL format (port optional)	Protocol
hostname/hostname:80	http/1.1 (current behaviour)
http://hostname	http/1.1 (explicitly)
https://hostname	require TLS; prefer http/2, but with http/1.1 fallback
h2c://hostname	hc2 (explicitly)