Dynamic reverse proxy with strip_prefix

[gister]

1. Caddy version (caddy version): v2.4.5

2. How I run Caddy:

caddy run

a. System environment:

Mac

My complete Caddyfile or JSON config:

localhost:2015

handle {
	uri strip_prefix /{http.request.uri.path.0}
	reverse_proxy {
		to www.{http.request.uri.path.0}:443
		header_up Host {http.reverse_proxy.upstream.host}
		transport http {
			tls
		}
	}
}

3. The problem I’m having:

I am trying to dynamically reverse-proxy a url like localhost:2015/google.com/robots.txt to www.google.com/robots.txt

Any ideas on how I can go about it?

4. What I already tried:

I tried the above Caddyfile but it rewrites the path before sending upstream.

[francislavoie]

Sounds like what you want is a forward proxy, not a reverse proxy. What you’re trying is really weird for reverse_proxy.

There is a forwardproxy Caddy plugin, but support for v2 isn’t complete, I think. (/cc @matt Support Caddy 2 by mholt · Pull Request #74 · caddyserver/forwardproxy · GitHub)

That said, you could probably use a path_regexp matcher to extract the part of the URL you want before stripping the prefix, then using the regexp capture group, which’ll be preserved after stripping.