Is there a module for converting HTTP requests to msgpack/JSON in Nginx?

Question

Nginx

There is a desire to make an HTTP handler application in X (arbitrary) language. The language can work with tcp/unix/pipe, process msgpack/json and issue it in response. It does not know how to work with HTTP (it is also not desirable to do support by hand).
The following chain lined up in my head:
-- http request ---> nginx + some module ---> msgpack/json --> backend
Unlike resty and others like it, backend should be a separate application.
Advantages:

• Scalability
  
• Independence from YaP
  

Question:
Do you know of any similar modules for Nginx or alternatives?

Answer 1

lua_nginx_module (aka openresty) + luasocket, for
example