TypeError: The view function did not return a valid response._白振峰的博客

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现象（描述）

现象：TypeError: The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a list.
描述：在使用Flask写接口的过程中，请求URL http://192.168.5.20:5000/diagnosis?symptom_word=%E5%91%BC%E5%90%B8%E8%A1%B0%E7%AB%AD%20%E5%91%BC%E5%90%B8%E5%9B%B0%E9%9A%BE%20%E8%85%B9%E5%BC%8F%E5%8F%8D%E5%B8%B8%E5%91%BC%E5%90%B8 ，返回值报如上的错。

flask下面的jsonify函数作用是，返回一个JSON类型的Response（一般用于把数据返回给前端，否则前端不能获取有效的数据，没有使用Python自带的json模块返回JSON数据，jsonify具有诸多自带JSON模块没有的特性，以更加适应前端，符合前端协议要求格式）

将需要返回的数据，使用jsonify返回。即将

return disease_list
from flask import jsonify
return jsonify(disease_list)
                    在使用Flask写接口的过程中，报错TypeError: The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a list.
				今天用execjs调用JS时，发现报错execjs._exceptions.ProgramError: ReferenceError: document is not defined
错误类型：文档对象未定义，解决方法，定义对象即可，习惯性定义变量嘛
var document ;？  
emmmmmmmmmmmmmmm….不行的，继续报错 
execjs._exceptions.ProgramError: TypeError: Cannot read property 'createElement' of undefined
若是报错：execjs._exceptions.Prog
				记一次flask项目开发中遇到的无脑问题。
TypeError: The view function did not return a valid response. The function either returned None
#错误的原因是，代码中缺少return
@app.route('/history_ocr/', methods=['GET', 'POST'])
def history_ocr():
    if request.method == 'GET':
        result
				网上查了很多资料，都没解决这个问题，方法已经有return了，但是还是报错TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.
后来才发现，我另外一个蓝图里面有个同名的路径，该同名路径无返回值。所以，在出现这种情况下，也要检查一下是否其他蓝图里有同名的路径
				url与视图的函数映射
访问book/list的url的时候发现是不可以访问的，因为我们返回额不是字典、元组等等，现在返回的是一个列表。
TypeError: The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a list.
翻译：该视图没有返回一个可以响应的类型，如字
				TypeError: The view function for ‘uploadImg’ did not return a valid response. The function either returned None or ended without a return statement.
解决方法：
①给函数写返回值（return一个值）
②看其他同名函数是否也return
③看看是不是代码少写了method
具体原博客添加链接描述
可能是前端没写也可能是后端没写
④函数只有在if的时候有返回值，但
				线上报警 5xx 错误，查看日志发现报这个错，
TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.
这个方法没有有效的返回结果
页面报这个错误
Internal Server E...
				Flask视图函数默认是不能返回list对象和None的，如果返回数据不对，就会抛出异常
TypeError: The view function did not return a valid response. 
The return type must be a string, dict, tuple, Response instance, or WSGI callable, 
but it was a JsonResponse.
以下将Flask改造为视图函数返回支持list、dict、None
					这个错误怎么解决：192.168.34.71 - - [14/Jan/2023 22:41:01] "GET /get_nb2_ip/ HTTP/1.1" 500 - Traceback (most recent call last):   File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2548, in __call__     return self.wsgi_app(environ, start_response)   File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2528, in wsgi_app     response = self.handle_exception(e)   File "/usr/local/lib/python3.8/dist-packages/flask_cors/extension.py", line 165, in wrapped_function     return cors_after_request(app.make_response(f(*args, **kwargs)))   File "/usr/local/lib/python3.8/dist-packages/flask_cors/extension.py", line 165, in wrapped_function     return cors_after_request(app.make_response(f(*args, **kwargs)))   File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2525, in wsgi_app     response = self.full_dispatch_request()   File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1823, in full_dispatch_request     return self.finalize_request(rv)   File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1842, in finalize_request     response = self.make_response(rv)   File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2170, in make_response     raise TypeError( TypeError: The view function did not return a valid response. The return type must be a string, dict, list, tuple with headers or status, Response instance, or WSGI callable, but it was a Response.代码是这个：@app.route('/get_nb2_ip/')   def get_nb2_ip():     #curl -i --basic -u admin:public -X GET "http://192.168.34.131:8081/api/v4/clients?_page=1&_limit=10"     response = requests.get('http:192.168.34.131:8081/api/v4/clients?_page=1&_limit=10', auth=('admin', 'public'))          return response