Installing drone on a sub-directory/path

Question

I am trying to install drone in a particular path of a domain, but it still tries to find it's resources in root directory. It's behind a Caddy Server. Example:- Want to install in http://abc.xyz.com/drone/

While it should find its resources(static,api,feed) likw http://abc.xyz.com/drone/static/app.css It tries to find it in http://abc.xyz.com/static/app.css

I can write URL re-writes but it seems counter intuitive, and could be prone to errors. How do I correct this?

My current caddyfile:-

https://abc.xyz.com { 
    proxy /drone/ http://127.0.0.1:8000 {
        transparent
        websocket
    }

}