在配置了channels+django的websocket后出现上传文件限制大小的413错误如何解决，及设置默认的错误页面会出现的报错

找到channels在python包目录如ubutnu18就在/home/xiangkejin/.local/lib/python3.6/site-packages/channels

找到这个目录下的http.py,编辑

    @sync_to_async
    def handle(self, body):
        """
        Synchronous message processing.
        """
        # Set script prefix from message root_path, turning None into empty string
        script_prefix = self.scope.get("root_path", "") or ""
        if settings.FORCE_SCRIPT_NAME:
            script_prefix = settings.FORCE_SCRIPT_NAME
        set_script_prefix(script_prefix)
        signals.request_started.send(sender=self.__class__, scope=self.scope)
        # Run request through view system
        try:
            request = self.request_class(self.scope, body)
        except UnicodeDecodeError:
            logger.warning(
                "Bad Request (UnicodeDecodeError)",
                exc_info=sys.exc_info(),
                extra={"status_code": 400},
            )
            response = http.HttpResponseBadRequest()
        except RequestTimeout:
            # Parsing the rquest failed, so the response is a Request Timeout error
            response = HttpResponse("408 Request Timeout (upload too slow)", status=408)
        except RequestAborted:
            # Client closed connection on us mid request. Abort!
            return
        #except RequestDataTooBig:   #在你不清楚你要上传的文件最大有多大的时候最好是吧这一段注释掉
        #    response = HttpResponse("413 Payload too large", status=413)   #注释掉

　　

然后找到managent/commands/下的runserver.py文件  编辑文件：

def inner_run(self, *args, **options):
        # Maybe they want the wsgi one?
        if not options.get("use_asgi", True):
            if hasattr(RunserverCommand, "server_cls"):
                self.server_cls = RunserverCommand.server_cls
            return RunserverCommand.inner_run(self, *args, **options)
        # Run checks
        self.stdout.write("Performing system checks...

")
        #self.check(display_num_errors=True)  #注释掉这一句
        self.check_migrations()
        # Print helpful text
        quit_command = "CTRL-BREAK" if sys.platform == "win32" else "CONTROL-C"
        now = datetime.datetime.now().strftime("%B %d, %Y - %X")
        self.stdout.write(now)