Neat, the backend is indeed very simple. If you prefer to run things locally, just invoking `nginx -c /path/to/nginx.conf -e err.log -g "daemon off;"` [1] and your curl command seems to be everything required, save for httpbin.

[1]: https://gist.github.com/jvns/edf78e7775fea8888685a9a2956bc47...