Caddyfile

localhost {
    handle_path /api/* {
        rewrite * /api{path}
        reverse_proxy https://whale-app-nm9uv.ondigitalocean.app {
                header_up Host {upstream_hostport}
                header_down Access-Control-Allow-Origin *
                header_down Access-Control-Allow-Methods "GET, POST, OPTIONS, PUT, DELETE"
                header_down Access-Control-Allow-Headers "Content-Type, Authorization"
                header_down Access-Control-Allow-Credentials true
        }

        @options {
                method OPTIONS
        }
        handle @options {
                respond "" 204
                header Access-Control-Allow-Origin *
                header Access-Control-Allow-Methods "GET, POST, OPTIONS, PUT, DELETE"
                header Access-Control-Allow-Headers "Content-Type, Authorization"
                header Access-Control-Allow-Credentials true
        }
    }
    # passthrough to frontend
    handle {
        reverse_proxy http://localhost:5173  
    }
}