Caddyfile

{ # global options
    admin off # theres no need for the admin api in railway's environment
    persist_config off # storage isn't persistent anyway
    auto_https off # railway handles https for us, this would cause issues if left enabled
    log { # runtime logs
        format console # set runtime log format to console mode 
    }
    servers { # server options
        trusted_proxies static private_ranges # trust railway's proxy
    }
}

:{$PORT} { # site block, listens on the $PORT environment variable, automatically assigned by railway
    log { # access logs
        format console # set access log format to console mode
    }

    reverse_proxy {$FRONTEND_HOST} # proxy all requests for /* to the frontend, configure this variable in the service settings

    # the handle_path directive will strip /api/ from the path before proxying
    # this is needed if your backend's api routes don't start with /api/
    # change paths as needed
    handle_path /api/* { # this strips the /api/ prefix from the uri sent to the proxy address
        reverse_proxy {$BACKEND_HOST} # proxy all requests for /api/* to the backend, configure this variable in the service settings
    }

    # if your backend's api routes do start with /api/ then you wouldn't want to strip the path prefix
    # if so, comment out the above handle_path block, and uncomment this reverse_proxy directive
    # change paths as needed
    # reverse_proxy {$BACKEND_HOST} # configure this variable in the service settings
}