'Retrieve the value of a request header.
@type name: C{bytes}
@param name: The name of the request header for which to retrieve the
value.  Header names are compared case-insensitively.
@rtype: C{bytes} or L{None}
@return: The value of the specified request header.'

def getHeader(self, name):

    return self.requestHeaders.getRawHeaders(name.lower(), [None])[0]
