Builds, sends and handles the responses to all requests listed in
        C{self.requests}.

def execute(self):
        """
        Builds, sends and handles the responses to all requests listed in
        C{self.requests}.
        """
        requests = self.requests[:]

        for r in requests:
            self.removeRequest(r)

        body = remoting.encode(self.getAMFRequest(requests),
            strict=self.strict)

        http_request = urllib2.Request(self._root_url, body.getvalue(),
            self._get_execute_headers())

        if self.proxy_args:
            http_request.set_proxy(*self.proxy_args)

        envelope = self._getResponse(http_request)

        return envelope