turn (req,res) pairs into a single duplex stream
npm install http-duplexTurn (req,res) pairs into a single readable/writable stream.

`` js`
var httpDuplex = require('http-duplex')
Return a new readable/writable duplex stream dup from the http request reqres
and http response .
dup has all the same methods has both req and res, but on a single object.
With npm do:
```
npm install http-duplex
MIT