Enable HTTP/2 to Origin not working with subdomains

Website, Application, Performance
1

Hello.

The setting “Enable HTTP/2 to Origin” is enabled, but the subdomains eg bla.example.com still use HTTP1.1 instead of HTTP2

How can this be, and how to resolve?

Thanks.

2

May I ask how did you troubleshoot this so far? :thinking:

Checking log files at the origin host/server?

Does your origi host/server work over HTTP2 on one of the supported and compatible HTTPS ports with Cloudflare proxy :orange: ?

What kind of a Web server are you using?

Is the sub-domain proxied :orange: ?