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4-9自定义异常报错，老师帮忙看看呢

来源：4-9 自定义APIException

aumujun

2021-06-07

报错如下

127.0.0.1 - - [07/Jun/2021 22:29:34] "POST /v1/client/register HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1966, in make_response
    rv = self.response_class.force_type(rv, request.environ)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/wrappers/response.py", line 263, in force_type
    response = Response(*run_wsgi_app(response, environ))
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/test.py", line 1229, in run_wsgi_app
    app_rv = app(environ, start_response)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/exceptions.py", line 221, in __call__
    response = t.cast("WSGIResponse", self.get_response(environ))
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/exceptions.py", line 209, in get_response
    headers = self.get_headers(environ, scope)
TypeError: get_headers() takes from 1 to 2 positional arguments but 3 were given

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 2301, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 2287, in wsgi_app
    response = self.handle_exception(e)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1733, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 2284, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1808, in full_dispatch_request
    return self.finalize_request(rv)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1823, in finalize_request
    response = self.make_response(rv)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1974, in make_response
    reraise(TypeError, new_error, sys.exc_info()[2])
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/_compat.py", line 34, in reraise
    raise value.with_traceback(tb)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1966, in make_response
    rv = self.response_class.force_type(rv, request.environ)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/wrappers/response.py", line 263, in force_type
    response = Response(*run_wsgi_app(response, environ))
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/test.py", line 1229, in run_wsgi_app
    app_rv = app(environ, start_response)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/exceptions.py", line 221, in __call__
    response = t.cast("WSGIResponse", self.get_response(environ))
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/exceptions.py", line 209, in get_response
    headers = self.get_headers(environ, scope)
TypeError: get_headers() takes from 1 to 2 positional arguments but 3 were given
The view function did not return a valid response. The return type must be a string, tuple, Response instance, or WSGI callable, but it was a ClientTypeError.
c^C%                                                                                                                                                  
(restful)  mac@macdeMac-mini  ~/Documents/restful  
(restful)  ✘ mac@macdeMac-mini  ~/Documents/restful  
(restful)  ✘ mac@macdeMac-mini  ~/Documents/restful  python3 ginger.py
 * Serving Flask app "app.app" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   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: 917-437-446
127.0.0.1 - - [07/Jun/2021 22:33:29] "POST /v1/client/register HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1966, in make_response
    rv = self.response_class.force_type(rv, request.environ)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/wrappers/response.py", line 263, in force_type
    response = Response(*run_wsgi_app(response, environ))
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/test.py", line 1229, in run_wsgi_app
    app_rv = app(environ, start_response)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/exceptions.py", line 221, in __call__
    response = t.cast("WSGIResponse", self.get_response(environ))
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/exceptions.py", line 209, in get_response
    headers = self.get_headers(environ, scope)
TypeError: get_headers() takes from 1 to 2 positional arguments but 3 were given

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 2301, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 2287, in wsgi_app
    response = self.handle_exception(e)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1733, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 2284, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1808, in full_dispatch_request
    return self.finalize_request(rv)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1823, in finalize_request
    response = self.make_response(rv)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1974, in make_response
    reraise(TypeError, new_error, sys.exc_info()[2])
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/_compat.py", line 34, in reraise
    raise value.with_traceback(tb)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/flask/app.py", line 1966, in make_response
    rv = self.response_class.force_type(rv, request.environ)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/wrappers/response.py", line 263, in force_type
    response = Response(*run_wsgi_app(response, environ))
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/test.py", line 1229, in run_wsgi_app
    app_rv = app(environ, start_response)
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/exceptions.py", line 221, in __call__
    response = t.cast("WSGIResponse", self.get_response(environ))
  File "/Users/mac/.local/share/virtualenvs/restful-V3yZnvwa/lib/python3.7/site-packages/werkzeug/exceptions.py", line 209, in get_response
    headers = self.get_headers(environ, scope)
TypeError: get_headers() takes from 1 to 2 positional arguments but 3 were given
The view function did not return a valid response. The return type must be a string, tuple, Response instance, or WSGI callable, but it was a ClientTypeError.

代码如下，老师帮忙看看呢

from flask import request, json
from werkzeug.exceptions import HTTPException

class APIException(HTTPException):
    code = 500
    msg = 'sorry, we made a mistake (*￣︶￣)!'
    error_code = 999

    def __init__(self, msg=None, code=None, error_code=None,
                 headers=None):
        if code:
            self.code = code
        if error_code:
            self.error_code = error_code
        if msg:
            self.msg = msg
        super(APIException, self).__init__(msg, None)

    def get_body(self, environ=None):
        body = dict(
            msg=self.msg,
            error_code=self.error_code,
            request=request.method + ' ' + self.get_url_no_param()
        )
        text = json.dumps(body)
        return text

    def get_headers(self, environ=None):
        """Get a list of headers."""
        return [('Content-Type', 'application/json')]

    @staticmethod
    def get_url_no_param():
        full_path = str(request.full_path)
        main_path = full_path.split('?')
        return main_path[0]
写回答

3回答

三棵

2021-09-11

我也遇到同样问题,开始也是一脸懵逼. 看到网探同学说的Werkzeug版本问题, 于是试了下卸载当前版本werkzeug重新安装werkzeug 1.0, 可以正常返回结果.

遇到同样问题的同学,在werkzeug2.0版本下解决也很简单, 因为2.0版本的`get_body()` 和`get_headers()`中多了一个参数,导致我们继承自定义`HTTPException`类的子类无法继承改写这两个方法,于是返回的自定义类不被认为是一个有效的response. 只要进入源码把`get_body()` 和`get_headers()`这两个类的参数也复制下来写到我们的自定义类里就可以了.

    def get_body(

    self,

    environ: t.Optional["WSGIEnvironment"] = None,

    scope: t.Optional[dict] = None,

    ) -> str:

        body = dict(

            msg=self.msg,

            error_code=self.error_code,

            request=request.method + ' ' + self.get_url_no_param()

        )

        text = json.dumps(body)

        return text

    def get_headers(

        self,

        environ: t.Optional["WSGIEnvironment"] = None,

        scope: t.Optional[dict] = None,

    ) -> t.List[t.Tuple[str, str]]:

        """Get a list of headers."""

        return [('Content-Type', 'application/json')]


0
0

网探

2021-07-22

这个问题主要是现在安装的Flask自带安装了Werkzeug2.0.1引起，之前老师的代码Werkzeug是1.0.1的，我之前能正常的代码，现在在新达的环境也是无法运行了，自定的APIException报同样错误。希望老师可以有兼容Werkzeug2的代码出来。

0
0

7七月

2021-06-09

看这个提示猜不出问题。编程需要自己调试下，或者再看下视频、核对下源码。

0
0

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