'Here we return the Content-Type set to multipart/post, including the
boundary.
:return: A tuple list with the headers required to send the
self._post_data to the wire. For example, if the data is
url-encoded:
a=3&b=2
This method returns:
Content-Length: 7
Content-Type: application/x-www-form-urlencoded
When someone queries this object for the headers using
get_headers(), we\'ll include these. Hopefully this means that
the required headers will make it to the wire.'

def get_headers(self):

    return [('Content-Type', (self.MULTIPART_HEADER % self.boundary))]
