Using "without" in http.proxy directive in Caddyfile in caddy

Question

I'm using the caddy as a reverse proxy and the config is the

proxy /app http://myapp:8080 {
    transparent
    insecure_skip_verify
    without /app 
  } 

http://myapp:8080 is an Web application. Here the request https://caddy/myapp redirects the request correctly but getting an error in the Web application while loading. But if make the call as https://caddy/myapp/ then it works correctly.

what is the reason behind this and how to over come this one ?

How do I strip only "app" in the configuration ?

for example :

 without app

Tried this but it isn't working . Any help is really appreciated , Thanks in advance.