Question

我在python Flask中有一个REST API，应该将字符串发布到先前定义的回调URL作为响应。这是我的代码：

return redirect(
    location=callback_url,
    code=200,
    Response=Response(status=200, response="Zeinab,Abbasimazar,1989,Sep,07")
)

但是我在控制台中遇到以下错误：

[2019-12-25 18:15:07,482] ERROR in app: Exception on /v1/PaymentPage [POST]
Traceback (most recent call last):
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 1951, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 1820, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/zeinab/PycharmProjects/paygate_service_rest/server.py", line 323, in payment_page
    Response=Response(status=200, response=transaction.get_transaction_result_string(res_code=0))
  File "/home/zeinab/.local/lib/python3.6/site-packages/werkzeug/utils.py", line 506, in redirect
    mimetype="text/html",
TypeError: __call__() got an unexpected keyword argument 'mimetype'

在我跟踪代码时，这是在方法python3.6/site-packages/werkzeug/utils.py的文件redirect中的库中设置的：

response = Response(
    '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n'
    "<title>Redirecting...</title>\n"
    "<h1>Redirecting...</h1>\n"
    "<p>You should be redirected automatically to target URL: "
    '<a href="%s">%s</a>.  If not click the link.'
    % (escape(location), display_location),
    code,
    mimetype="text/html",
)

我已将代码更改为：

return redirect(
    location=callback_url,
    code=200,
    Response="Zeinab,Abbasimazar,1989,Sep,07"
)

现在我得到了：

[2019-12-25 18:26:01,109] ERROR in app: Exception on /v1/PaymentPage [POST]
Traceback (most recent call last):
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 1951, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 1820, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/zeinab/.local/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/zeinab/PycharmProjects/paygate_service_rest/server.py", line 324, in payment_page
    Response=msg
  File "/home/zeinab/.local/lib/python3.6/site-packages/werkzeug/utils.py", line 506, in redirect
    mimetype="text/html",
TypeError: 'str' object is not callable

如何跳过mimetype标头或进行更改？我的图书馆需要升级吗？

Answer 1

return redirect(
    location=callback_url,
    code=200,
    Response=Response(status=200, response="Zeinab,Abbasimazar,1989,Sep,07")
)

flask.redirect()的{{3}}是301、302、303、305、307和308。所有HTTP重定向均以3xx开头。我不确定特定异常的确切原因，但这很可能是原因。如果我不得不猜测的话，Flask不会在重定向请求中出现模仿类型，因为HTTP重定向（至少是Flask支持的重定向）没有主体，只有标头。尝试将代码更新为此：

return redirect(location=callback_url, code=302)

HTTP状态为200告诉浏览器请求已成功完成，并且应呈现正文中返回的内容。某些响应（例如4xx响应）也可以具有主体，因为尽管发生了错误，服务器仍可能能够返回HTML以供浏览器呈现（例如自定义404页面）。但是，大多数3xx代码不允许具有主体，而应该具有Location标头，浏览器将在收到请求后导航至该标头。体内的内容将被忽略。可以在only supported status codes中找到HTTP状态代码的有用列表。

关于问题的后半部分，当第二次更改代码时，您将Response参数替换为以下内容：

Response="Zeinab,Abbasimazar,1989,Sep,07"

您本来是正确的（不输入响应代码）； flask.redirect方法正在为Response参数寻找类型为Response的对象（我知道这很令人困惑），但是您传入的是str类型的对象。

希望这会有所帮助。

TLDR：将code方法的redirect参数更改为支持的重定向状态代码之一，并且不要尝试返回响应正文。

在Flask中调用重定向时获得意外的关键字参数'mimetype'

1 个答案: