Combining rewrite and reverse_proxy

[matt (Matt Holt)]

Your backend application will need to be configured to run in a subfolder:

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…

Or you can perform replacements in response bodies (somewhat finicky). That linked wiki has more details.

(This is not a Caddy-specific problem; just something that affects all apps that are reverse-proxied. Many apps are poorly-designed.)