Fasthttp simple reverse proxy

This is just for testing and trying to debug valyala/fasthttp#348

Run the proxy and an http test server

docker-compose up -d

By default, the port where the proxy listens is :8000. If you need to change the ports, change them in the docker-compose.yml

curl -v http://127.0.0.1:8000/GET/200

The request will to through the proxy and hit the http_test_server and return the response.