信号器 CORS 问题

在我的服务器端，我使用带有信号器的 Web api 2。 在我的客户端，我使用的是 angularjs。

这是我启动信号连接时的 http 请求：

> GET
> http://example.com/signalr/negotiate?clientProtocol=1.4&connectionData=%5B%7B%22name%22%3A%22main%22%7D%5D&_=1416702959615 HTTP/1.1 Host: mysite.net Connection: keep-alive Pragma: no-cache
> Cache-Control: no-cache Accept: text/plain, */*; q=0.01 Origin:
> http://lh:51408 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64)
> AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.65
> Safari/537.36 Content-Type: application/x-www-form-urlencoded;
> charset=UTF-8 Referer: http://localhost:51408/ Accept-Encoding: gzip,
> deflate, sdch Accept-Language: en-US,en;q=0.8 Cookie:
> ARRAffinity=9def17406de898acdc2839d0ec294473084bbc94a8f600c867975ede6f136080

以及回应：

> HTTP/1.1 200 OK Cache-Control: no-cache Pragma: no-cache
> Transfer-Encoding: chunked Content-Type: application/json;
> charset=UTF-8 Expires: -1 Server: Microsoft-IIS/8.0
> X-Content-Type-Options: nosniff X-AspNet-Version: 4.0.30319
> X-Powered-By: ASP.NET Date: Sun, 23 Nov 2014 00:36:13 GMT
> 
> 187
> {"Url":"/signalr","ConnectionToken":"6BKcLqjNPyOw4ptdPKg8jRi7xVlPMEgFUdzeJZso2bnXliwfY4WReQWHRpmB5YEZsbg14Au7AS5k5xS5/4qVheDxYoUkOjfFW0W8eAQsasjBaSQOifIilniU/L7XQ1+Y","ConnectionId":"f2fc7c47-c84f-49b8-a080-f91346dfbda7","KeepAliveTimeout":20.0,"DisconnectTimeout":30.0,"ConnectionTimeout":110.0,"TryWebSockets":true,"ProtocolVersion":"1.4","TransportConnectTimeout":5.0,"LongPollDelay":0.0}
> 0

但是，在我的 javascript 中，连接时收到以下错误响应：

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhos:51408' is therefore not allowed access.

在我的服务器端，我的启动方法如下所示：

public void Configuration(IAppBuilder app)
{
    System.Web.Mvc.AreaRegistration.RegisterAllAreas();
    ConfigureOAuth(app);
    GlobalConfiguration.Configure(WebApiConfig.Register);
    app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
}

难道这不应该确保 cors 也在信号器中使用吗？还是我错过了一些东西？

对于那些在 Angular、SignalR 2.0 和 Web API 2.2 上遇到同样问题的人，

我能够通过以下方式解决这个问题添加cors配置 in 网络配置 and 没有他们在webapiconfig.cs and 启动.cs

对下面的 web.config 进行了更改<system.webServer>如下

<httpProtocol>
  <customHeaders>
    <add name="Access-Control-Allow-Origin" value="http://localhost" />
    <add name="Access-Control-Allow-Methods" value="*" />
    <add name="Access-Control-Allow-Credentials" value="true" />
  </customHeaders>
</httpProtocol>