You can configure the application using the following environment variables:
SERVER_PORT: port this application should listen on (default:8080),SERVER_HOST: host this application should listen on (default:0.0.0.0),RATE_LIMIT_NUMBER: max number of allowed requests in a period of time (default:60),RATE_LIMIT_PERIOD: configure the period of time where requests should be counted (default:5 minutes),ALLOWED_HOSTNAMES: coma-separated list of allowed domains to proxy
By default, this application has a rate limit which you can easily configure. This is for preventing any spam.
It also contains a list of allowed domains. This should be explicitly defined. This prevents the make of untrusted requests to any other backend, which can be suspicious.