Django：在自定义404错误处理程序中显示由Http404（“msg”）传递的错误消息(Django: Display error message passed by Http404(“msg”) in custom 404 error handler)

 使用django 1.11，我通过写入我的主URLs.py来定义一个自定义404处理程序： 
 
handler404 = 'myApp.views.myError'
 
 函数myError()看起来像这样： 
 
def myError(request):
    #errorMsg=request.error_404_message
    return render(request,'404.html')
 
 当我调用raise Http404("My msg")时，此功能有效。 但是，当我尝试通过Http404调用传递消息时（请参阅myError中的注释部分），我的代码崩溃了： 
 
 
 
 服务器错误（500） 
 
 
 那我怎么能得到错误信息？ 我读了很多关于它的问题，但大多数答案都是指在html文件中获取消息而不是在自定义python错误处理函数中。 
 
 编辑：问题是，我看不到调试页面，因为错误显然只发生在调用myError（）时才发生，只有在设置中debug=False时才会发生。 

Using django 1.11, I have defined a custom 404 handler, by writing in my main URLs.py:
 
handler404 = 'myApp.views.myError'
 
The function myError() looks like this:
 
def myError(request):
    #errorMsg=request.error_404_message
    return render(request,'404.html')
 
This function works when I call raise Http404("My msg"). However, when I try to get the message passed by the Http404 call (see commented section in myError), my code crashes:
 
 
 
Server Error (500)
 
 
How can I then get the error message? I read a lot of questions about it like this one, but most answers refer to getting the message in the html file and not in a custom python error handler function.
 
EDIT: The problem is, that I cannot see the debug page, because the error obviously only occurs when myError() is called and this happens only, if debug=False in the settings. 

原文：https://stackoverflow.com/questions/44570029