Change protocol from HTTP/2 to HTTP/1.1?

[francislavoie]

What I’m asking is whether your proxied service expects /admin to not be there. Caddy will preserve the path of the original request unless you strip a prefix using a rewrite. The handle_path directive does that.

Please read this wiki on the topic of proxying using a subpath:

The "subfolder problem", OR, "why can't I reverse proxy my app into a subfolder?"

Have you ever tried to reverse proxy an app into its own little subfolder of your domain name? Makes things neat, doesn’t it? Using example.com/foo/ for one app, example.com/bar/ for another. If you’re coming here from one of the selfhosted communities, you might be thinking along the lines of example.com/sonarr/, example.com/radarr/ etc. Chances are, you’ve tried some configuration along these lines: example.com { redir /sonarr /sonarr/ handle_path /sonarr/* { reverse_proxy localhost…

I generally recommend using a subdomain instead as it avoids most of the issues with proxying to another service that doesn’t expect to be served under a subpath.