What's wrong with downloading big files?
There is non-trival example:

<pre>
settings:
    staticDir = "static"
    port = Port(8080)
routes:
  get "/":
    redirect(request.makeUri("/index.html") )   

runForever()   
</pre>

I just put a 9MB file inside `static` dir, and download it :
http://127.0.0.1:8080/test.zip,  it consumes memory from about 5MB to over 50MB,  

It seems full duplex pipeline( using `socketpair`) is not used. 
Is any way to  open it, thank you!
