code: function onResponse( res ) {
  		self.res.status = res.statusCode;
  		self.res.headers = res.headers;
  
  		// TODO: record headers length
  
  		res.on( 'data', onData );
  		res.on( 'end', onEnd );
  	}
docs: FUNCTION: onResponse( response )
  Callback invoked upon receiving an HTTP response.
  
  @private
  @param {Object} response - HTTP response object