To make a form-data POST request to Falkonry API server using stream
        :param url: string
        :param form_data: form-data

def upstream(self, url, form_data):
        """
        To make a form-data POST request to Falkonry API server using stream
        :param url: string
        :param form_data: form-data
        """
        response = requests.post(
            self.host + url,
            files=form_data['files'] if 'files' in form_data else {},
            headers={
                'Authorization': 'Bearer ' + self.token,
                'x-falkonry-source':self.sourceHeader
            },
            verify=False
        )
        if response.status_code == 202 or response.status_code == 200:
            try:
                return json.loads(response._content.decode('utf-8'))
            except Exception as e:
                return json.loads(response.content)
        elif response.status_code == 401:
            raise Exception(json.dumps({'message':'Unauthorized Access'}))
        else:
            raise Exception(response.content)