Hosting from a subdirectory

[DhruvaSambrani]

I would like to host the app on my.domain.com/maybe/ behind a caddy reverse proxy. However it seems that the app is not aware of this, and there is no envvar to set this either. Typically, this is called baseurl, subdirectory or subpath in other hosted apps.

Current behaviour is that accessing my.domain.com/maybe/ redirects to my.domain.com/registration/new, but it should redirect to my.domain.com/maybe/registration/new.

I don't think the reverse proxy setting can help much here, but in any case:

my.domain.com {
        handle_path /maybe/* {                                                
                reverse_proxy localhost:3000 {                                
                        header_up Host {host}                                 
                        header_up X-Real-IP {remote}                          
                        header_up X-Forwarded-For {remote}                    
                        header_up X-Forwarded-Port {server_port}              
                        header_up X-Forwarded-Proto {scheme}                  
                        header_up X-Forwarded-Prefix /maybe/                  
                }                                                             
        }                                                                     
        redir /maybe /maybe/
}

Note that changing handle_path to handle leads to the server receiving the path being accessed as /maybe/ which obviously doesn't exist.

Is this supported? If so how? If not is there interest in adding this?