def post(self, url, body="", headers={}, retry=True):
        """Execute an HTTP POST request and return a dict containing the
        response and the response status code.

        Keyword arguments:
        url -- The path to execute the result against, not including the API
               version or project ID, with no leading /. Required.
        body -- A string or file object to send as the body of the request.
                Defaults to an empty string.
        headers -- HTTP Headers to send with the request. Can overwrite the
                   defaults. Defaults to {}.
        retry -- Whether exponential backoff should be employed. Defaults
                 to True.
        """
        headers["Content-Length"] = str(len(body))
        return self.request(url=url, method="POST", body=body, headers=headers,
                retry=retry)