Cors with SignalR - 解决“The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' 错误

Question

我正在使用 Angular 2 和 ASP.NET Core with SignalR。

我遇到如下错误：

XMLHttpRequest cannot load http://localhost:55916/signalr//signalr/negotiate?clientProtocol=1.5&connectionData=%5B%7B%22name%22%3A%22event%22%7D%5D&_=1486394845411. The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. Origin 'http://localhost:8080' is therefore not allowed access. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.

这是我的应用配置：

   public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            var signingKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Configuration["data:secretKey"]));

            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();
                        

            app.UseCors(config =>
                 config.AllowAnyHeader().AllowAnyMethod().AllowAnyOrigin());

            app.UseWebSockets();
            app.UseSignalR("/signalr");

            app.UseMvc();
        }

我也有 Angular 2 SignalR 服务

constructor(){
 //setups...

  this.connection = $.hubConnection(this.baseUrl + 'signalr/');
    this.proxy = this.connection.createHubProxy(this.proxyName);

    this.registerOnServerEvents();

    this.startConnection();
}

正在注册服务器事件：

 private registerOnServerEvents(): void {
        this.proxy.on('FoodAdded', (data: any) => {
            debugger;
            this.foodchanged.emit(data);
        });

        this.proxy.on('FoodDeleted', (data: any) => {
            debugger;
            this.foodchanged.emit('this could be data');
        });

        this.proxy.on('FoodUpdated', (data: any) => {
            debugger;
            this.foodchanged.emit('this could be data');
        });

        this.proxy.on('SendMessage', (data: ChatMessage) => {
            debugger;
            console.log('received in SignalRService: ' + JSON.stringify(data));
            this.messageReceived.emit(data);
        });

        this.proxy.on('newCpuValue', (data: number) => {
            debugger;
            this.newCpuValue.emit(data);
        });
    }

错误从头开始。

Answer 1

只要您的应用程序中使用了凭据安全性，您就应该指定 CORS 请求可能来自您的服务器的域：

app.UseCors(config => config.WithOrigins("http://localhost:8080"));

如果您允许来自世界上任何域的 CORS 请求，则凭据安全性的价值会大大降低。这就是错误消息告诉我们的内容。

Answer 2

这对我有用

    app.UseCors(config => config.AllowAnyHeader().AllowAnyMethod().AllowAnyOrigin().AllowCredentials());

必须添加 AllowCredentials 选项

Answer 3

我明白了。在客户端设置连接时，我必须添加

withCredentials

属性为假

因此代码如下所示：

private startConnection(): void {
    this.connection.start({ withCredentials: false }).done((data: any) => {
        this.connectionEstablished.emit(true);
        this.connectionExists = true;
    }).fail((error: any) => this.connectionEstablished.emit(false));
}

Cors with SignalR - 解决“The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' 错误

Cors with SignalR - solving the "The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' error

signalr

angularjs

asp.net-core