Debugging reverse proxy to localhost from docker

[TermeHansen (Rasmus Lundsgaard)]

solved…

the key was this:

However, you have to make sure your service on the actual host is listening on whatever host.docker.internal resolves to (usually 172.17.0.1 - the docker0 interface).
Meaning, if you configured that service on the host to only listen on 127.0.0.1 , you will have to change that.

from:

Setting reverse proxy from withing docker caddy to localhost service

Yep, this is correct. To work around that, you could either add extra_hosts to your docker-compose.yml like so: - /appdata/caddy/caddy-data:/data environment: - EMAIL=user@example.com # The email address to use for ACME registration. networks: - proxy_net + extra_hosts: + - host.docker.internal:host-gateway networks: proxy_net: Which adds another hostname to /etc/hosts within the caddy container. With that, you will be able to use that new hostname …

So rolling with host mode on docker