Identical to WebPypeClient.execute(), except this function accepts a
        url instead of a dictionary or string.

def execute_from_url(self, url, input_url):
        '''
        Identical to WebPypeClient.execute(), except this function accepts a
        url instead of a dictionary or string.

        '''
        inputs = self._request(input_url)
        resp = self.execute(url, inputs)
        return resp