asp.net-mvc-4 - SignalR 连接错误

Question

我有一个使用 SignalR 和 MVC 运行的简单聊天客户端项目，它与 ASP.Net One 几乎相同(我只是在试验 - 客户端代码是相同的)。我已经连接了以下设备来观察事情的发生:

$.connection.hub.stateChanged(function(state){console.log(state)});

连接工作正常，但我注意到，如果我关闭 IIS Express 并在 Chrome 中观看控制台，我会看到以下内容:

//As you would expect the state goes from connected to connecting
Object {oldState: 1, newState: 2}

//Then it times out after about 30 secs and throws this awesomeness at the console
WebSocket connection to 'ws://localhost:61623/signalr?transport=webSockets&connectionToken=VDF640emz7PFMToC6vxle_5-7QS5dZMszV4SPbQO7EFEmSSsITnwKsZreqfl4MGq8TXitG2xB5F-2ZdHp-2t3shPzN2hemTY1ZmEWlB8NOn5orUVexaSoARk9XjEO5B00&connectionData=%5B%7B%22name%22%3A%22chathub%22%7D%5D&messageId=B%2C7%7CL%2C0%7CM%2C0%7CN%2C0&tid=0' failed: WebSocket is closed before the connection is established. jquery.signalR-1.0.1.js:1117

//Reconnecting to Disconnecting - so why the error above?
Object {oldState: 2, newState: 4} 

//Then radio silence if I start IIS again...

2 个问题:

尝试重新连接失败时如何避免出现错误？

为什么 SignalR 不继续尝试连接到 IIS？我的印象是这就是技术的重点......

编辑:FireFox 中也会发生同样的事情

Answer 1

最终，连接将终止并停止重试。您可以使用 SignalR 文档中的此方法让它不断重新连接。

How to continuously reconnect

How to continuously reconnect

In some applications you might want to automatically re-establish a connection after it has been lost and the attempt to reconnect has timed out. To do that, you can call the Start method from your Closed event handler (disconnected event handler on JavaScript clients). You might want to wait a period of time before calling Start in order to avoid doing this too frequently when the server or the physical connection are unavailable. The following code sample is for a JavaScript client using the generated proxy.

$.connection.hub.disconnected(function() {
   setTimeout(function() {
       $.connection.hub.start();
   }, 5000); // Restart connection after 5 seconds.
});