docs: 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)