Django2.1.8升级到2.2.3迁移报错handler403、404问题

## 迁移报错 ```bash # python manage.py makemigrations SystemCheckError: System check identified some issues: ERRORS: ?: (urls.E007) The custom handler403 view 'StarMeow.urls.permission_denied' does not take the correct number of arguments (request, exception). ?: (urls.E007) The custom handler404 view 'StarMeow.urls.page_not_found' does not take the correct number of arguments (request, exception). ``` ## Django2.1源码在2.2版本上也没发生大变化 ```python # django/views/defaults.py from django.http import ( HttpResponseBadRequest, HttpResponseForbidden, HttpResponseNotFound, HttpResponseServerError, ) from django.template import Context, Engine, TemplateDoesNotExist, loader from django.views.decorators.csrf import requires_csrf_token ERROR_404_TEMPLATE_NAME = '404.html' ERROR_403_TEMPLATE_NAME = '403.html' ERROR_400_TEMPLATE_NAME = '400.html' ERROR_500_TEMPLATE_NAME = '500.html' # This can be called when CsrfViewMiddleware.process_view has not run, # therefore need @requires_csrf_token in case the template needs # {% csrf_token %}. @requires_csrf_token def page_not_found(request, exception, template_name=ERROR_404_TEMPLATE_NAME): """ Default 404 handler. Templates: :template:`404.html` Context: request_path The path of the requested URL (e.g., '/app/pages/bad_page/') exception The message from the exception which triggered the 404 (if one was supplied), or the exception class name """ exception_repr = exception.__class__.__name__ # Try to get an "interesting" exception message, if any (and not the ugly # Resolver404 dictionary) try: message = exception.args[0] except (AttributeError, IndexError): pass else: if isinstance(message, str): exception_repr = message context = { 'request_path': request.path, 'exception': exception_repr, } try: template = loader.get_template(template_name) body = template.render(context, request) content_type = None # Django will use DEFAULT_CONTENT_TYPE except TemplateDoesNotExist: if template_name != ERROR_404_TEMPLATE_NAME: # Reraise if it's a missing custom template. raise template = Engine().from_string( '<h1>Not Found</h1>' '<p>The requested URL {{ request_path }} was not found on this server.</p>') body = template.render(Context(context)) content_type = 'text/html' return HttpResponseNotFound(body, content_type=content_type) @requires_csrf_token def server_error(request, template_name=ERROR_500_TEMPLATE_NAME): """ 500 error handler. Templates: :template:`500.html` Context: None """ try: template = loader.get_template(template_name) except TemplateDoesNotExist: if template_name != ERROR_500_TEMPLATE_NAME: # Reraise if it's a missing custom template. raise return HttpResponseServerError('<h1>Server Error (500)</h1>', content_type='text/html') return HttpResponseServerError(template.render()) @requires_csrf_token def bad_request(request, exception, template_name=ERROR_400_TEMPLATE_NAME): """ 400 error handler. Templates: :template:`400.html` Context: None """ try: template = loader.get_template(template_name) except TemplateDoesNotExist: if template_name != ERROR_400_TEMPLATE_NAME: # Reraise if it's a missing custom template. raise return HttpResponseBadRequest('<h1>Bad Request (400)</h1>', content_type='text/html') # No exception content is passed to the template, to not disclose any sensitive information. return HttpResponseBadRequest(template.render()) # This can be called when CsrfViewMiddleware.process_view has not run, # therefore need @requires_csrf_token in case the template needs # {% csrf_token %}. @requires_csrf_token def permission_denied(request, exception, template_name=ERROR_403_TEMPLATE_NAME): """ Permission denied (403) handler. Templates: :template:`403.html` Context: None If the template does not exist, an Http403 response containing the text "403 Forbidden" (as per RFC 7231) will be returned. """ try: template = loader.get_template(template_name) except TemplateDoesNotExist: if template_name != ERROR_403_TEMPLATE_NAME: # Reraise if it's a missing custom template. raise return HttpResponseForbidden('<h1>403 Forbidden</h1>', content_type='text/html') return HttpResponseForbidden( template.render(request=request, context={'exception': str(exception)}) ) ``` ```python # django/conf/urls/__init__.py from django.urls import include, re_path from django.views import defaults __all__ = ['handler400', 'handler403', 'handler404', 'handler500', 'include', 'url'] handler400 = defaults.bad_request handler403 = defaults.permission_denied handler404 = defaults.page_not_found handler500 = defaults.server_error def url(regex, view, kwargs=None, name=None): return re_path(regex, view, kwargs, name) ``` ## 确认问题，检查是全局403、404的问题 少了一个`exception`参数，意思是 > 来自异常的消息，该异常触发404(如果有的话)或异常类名 ```python # 全局403、404、500错误自定义页面显示 def page_not_found(request, exception=404): return render(request, '404.html') def page_error(request): return render(request, '500.html') def permission_denied(request, exception=403): return render(request, '403.html') # 定义错误跳转页面 handler403 = permission_denied handler404 = page_not_found handler500 = page_error ``` 但上一个版本就是正常的，那，我也不知道了~

明人不说暗话 领红包就是支持！！！ 来都来了，再到页面底部看下呗~ ↓ ↓ ↓

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