Flask尝试序列化为JSON，尽管mimetype=text/plain

我有一个API，我正在发布

application/json

数据，我想从中返回

text/plain

。我得到以下错误：

TypeError: Object of type 'Response' is not JSON serializable

即使我明确地将

text/plain

设置为mimetype：

return Response(ret_str, mimetype='text/plain')

我的帖子如下：

headers = {"Content-Type":"application/json", "Accept":"text/plain"}
r = requests.post(url, data = json.dumps(data), headers = headers)

我做错了什么

编辑：完全回溯

Traceback (most recent call last):
  File "/root/miniconda3/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/root/miniconda3/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/root/miniconda3/lib/python3.6/site-packages/flask_restful/__init__.py", line 484, in wrapper
    return self.make_response(data, code, headers=headers)
  File "/root/miniconda3/lib/python3.6/site-packages/flask_restful/__init__.py", line 513, in make_response
    resp = self.representations[mediatype](data, *args, **kwargs)
  File "/root/miniconda3/lib/python3.6/site-packages/flask_restful/representations/json.py", line 21, in output_json
    dumped = dumps(data, **settings) + "\n"
  File "/root/miniconda3/lib/python3.6/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/root/miniconda3/lib/python3.6/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/root/miniconda3/lib/python3.6/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/root/miniconda3/lib/python3.6/json/encoder.py", line 180, in default
    o.__class__.__name__)
TypeError: Object of type 'Response' is not JSON serializable

---

我们能看到更多的回溯吗？没有任何内容跳出为无效。另外，请尝试为返回字符串使用命名的arg，我不确定该位置arg的设置：

返回响应（Response=ret_str，mimetype='text/plain'，status=200）

@wholevinski backtrace posted因此看起来flask_restful正在为您做出响应，他们的代码只支持现成的JSON。要扩展它，您需要遵循以下说明：有趣！但它确实适用于GET请求……是否只是针对POST，而restful无法处理非JSON？