Trying to match http://nodejs.org/docs/latest/api/http.html.
For the server response:
* Change writeBody to write
* Change writeHeaders to writeHead
For the request object, 'headers' is now an object containing all
key-value pairs of the actual HTTP headers.
'queryString' is folded into 'url' key.
Non-standard keys in the request: isSSL, remotePort, remoteIP,
remoteUser, are disabled in the mean-time (will be revisited after 1.4
release).
Implementation-wise, the request object is now a simple key-value pair
using QVariant, as opposed to the heavy QObject instance.
http://code.google.com/p/phantomjs/issues/detail?id=115
We have to include this check for the content-length header (since it's auto generated), however, the script is supposed to take care of not sending any message body; but we've taken care of that anyways, to conform a little more to standards.