收到 500 内部服务器错误 Flask 应用程序

Posted 2023-02-15

【中文标题】收到 500 内部服务器错误 Flask 应用程序

【英文标题】：getting 500 Internal server error Flask app

【发布时间】：2022-01-12 19:16:40

【问题描述】：

尝试通过 Postman 访问 http://localhost:5000/token 时（POST 请求）

POST 请求详情： "电子邮件": "[e-mail]", “密码”：“xdE56”

目的是测试登录功能。访问令牌应出现在 响应正文。 我收到以下错误

* Serving Flask app "app" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 112-744-944
127.0.0.1 - - [07/Dec/2021 18:08:40] "POST /token HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/app.py", line 2328, in __call__
    return self.wsgi_app(environ, start_response)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/app.py", line 2314, in wsgi_app
    response = self.handle_exception(e)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask_restful/__init__.py", line 269, in error_router
    return original_handler(e)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/app.py", line 1760, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value.with_traceback(tb)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/app.py", line 2311, in wsgi_app
    response = self.full_dispatch_request()
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/app.py", line 1834, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask_restful/__init__.py", line 269, in error_router
    return original_handler(e)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/app.py", line 1737, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value.with_traceback(tb)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/app.py", line 1832, in full_dispatch_request
    rv = self.dispatch_request()
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/app.py", line 1818, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask_restful/__init__.py", line 458, in wrapper
    resp = resource(*args, **kwargs)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask/views.py", line 88, in view
    return self.dispatch_request(*args, **kwargs)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask_restful/__init__.py", line 573, in dispatch_request
    resp = meth(*args, **kwargs)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/resources/token_management.py", line 33, in post
    access_token = create_access_token(identity=user.id, fresh=True)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask_jwt_extended/utils.py", line 157, in create_access_token
    return jwt_manager._create_access_token(identity, fresh, expires_delta, user_claims)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask_jwt_extended/jwt_manager.py", line 479, in _create_access_token
    json_encoder=config.json_encoder
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask_jwt_extended/tokens.py", line 77, in encode_access_token
    json_encoder=json_encoder)
  File "/root/PycharmProjects/pythonProject/smilecook-test-L_1-4/venv/lib/python3.7/site-packages/flask_jwt_extended/tokens.py", line 31, in _encode_jwt
    json_encoder=json_encoder).decode('utf-8')
AttributeError: 'str' object has no attribute 'decode'

Postman 响应正文应显示 access_token。

编码问题有没有可能？

【问题讨论】：

您还没有发布有问题的 Python 代码。不过.decode() 可能是多余的。

你认为检查代码有用吗？我要发吗？

以防万一...这里有***.com/questions/70258682/…我问了另一个实际上与同一问题相关的问题..谢谢。

【参考方案1】：

在 Flask 中包含处理路由的一段代码（即在 POST 之后进行处理）通常可以更容易地调试问题。

从错误日志中，我怀疑某处有一段代码正在执行<string>.decode('utf-8')，但在 Python3 中，所有字符串都是 unicode，因此通常的解决方案是删除 decode('utf-8')。如果这不是您的代码（例如您使用的是库），您需要确保您使用的库的版本与 Python3 兼容，例如如果这是您正在使用的库，请参阅 PyJWT 库的 this *** 响应。

【讨论】：

.decode('utf-8') 不是我的代码的一部分。 Flask-JWT-Extended 3.20.0 也是我用作库的工具