code: def __stringify_response(response_data):
      
      for key, value in response_data.items():
  
          if isinstance(value, list):
              value = json.dumps(value, indent=2, ensure_ascii=False)
  
          elif isinstance(value, bytes):
              try:
                  encoding = response_data.get("encoding")
                  if not encoding or encoding == "None":
                      encoding = "utf-8"
  
                  if key == "content" and "image" in response_data["content_type"]:
                      # display image
                      value = "data:{};base64,{}".format(
                          response_data["content_type"],
                          b64encode(value).decode(encoding)
                      )
                  else:
                      value = escape(value.decode(encoding))
              except UnicodeDecodeError:
                  pass
  
          elif not isinstance(value, (basestring, numeric_types, Iterable)):
              # class instance, e.g. MultipartEncoder()
              value = repr(value)
  
          elif isinstance(value, requests.cookies.RequestsCookieJar):
              value = value.get_dict()
  
          response_data[key] = value
docs: stringfy HTTP response data
  
      Args:
          response_data (dict):
  
              {
                  "status_code": 404,
                  "headers": {
                      "Content-Type": "application/json",
                      "Content-Length": "30",
                      "Server": "Werkzeug/0.14.1 Python/3.7.0",
                      "Date": "Tue, 27 Nov 2018 06:19:27 GMT"
                  },
                  "encoding": "None",
                  "content_type": "application/json",
                  "ok": false,
                  "url": "http://127.0.0.1:5000/api/users/9001",
                  "reason": "NOT FOUND",
                  "cookies": {},
                  "json": {
                      "success": false,
                      "data": {}
                  }
              }