Accessing original host IP

[maracko]

How can I access the original IP address of the remote host that tried to access a domain that is managed by caddy-docker proxy?

[francislavoie]

Caddy adds the X-Forwarded-For header to requests to the proxy upstream https://caddyserver.com/docs/caddyfile/directives/reverse_proxy#headers

But, if you're running in swarm mode, you may run into this issue: moby/moby#25526. Gist of it is that swarm's TCP ingress will cause the remote IP to be rewritten, so the original client's IP would be lost. There's some workarounds listed in that thread that you may want to try.

[maracko]

On my Go server I have CORS headers set up but the caddy doesn't send X-Forwarded-For header, do I have to turn it on somewhere?

[francislavoie]

Those are response headers. The X-Forwarded-For header is passed in the upstream request.