If you want to use host headers in development with self hosted ASP .NET SignalR 2.0, you can add the hostheader to your hosts file, found in C:\Windows\System32\Drivers\etc

image

 

Then use the following adjusted client and server from the tutorial at http://www.asp.net/signalr/overview/getting-started/tutorial-signalr-self-host:

 

Server

namespace SignalRSelfHost
{
    using System;
    using Microsoft.AspNet.SignalR;
    using Microsoft.Owin.Hosting;
    using Owin;

    class Program
    {
        static void Main(string[] args)
        {
            // This will *ONLY* bind to localhost, if you want to bind to all addresses
            // use http://*:8080 to bind to all addresses. 
            // See http://msdn.microsoft.com/en-us/library/system.net.httplistener.aspx 
            // for more information.
            
            //string url = "http://localhost:8080";
            string url = "http://rlitest.nl";

            using (WebApp.Start<Startup>(url))
            {
                Console.WriteLine("Server running on {0}", url);
                Console.ReadLine();
            }
        }
    }
    class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            var config = new HubConfiguration();
            config.EnableJSONP = true;
            app.MapSignalR(config);
        }
    }
    public class MyHub : Hub
    {
        public void Send(string name, string message)
        {
            Clients.All.addMessage(name, message);
        }
    }
}

Client

<!DOCTYPE html>
<html>
<head>
    <title>SignalR Simple Chat</title>
    <style type="text/css">
        .container {
            background-color: #99CCFF;
            border: thick solid #808080;
            padding: 20px;
            margin: 20px;
        }
    </style>
</head>
<body>
    <div class="container">
        <input type="text" id="message" />
        <input type="button" id="sendmessage" value="Send" />
        <input type="hidden" id="displayname" />
        <ul id="discussion"></ul>
    </div>
    <!--Script references. -->
    <!--Reference the jQuery library. -->
    <script src="Scripts/jquery-1.6.4.min.js"></script>
    <!--Reference the SignalR library. -->
    <script src="Scripts/jquery.signalR-2.0.0-rc1.min.js"></script>
    <!--Reference the autogenerated SignalR hub script. -->
    <script src="http://rlitest.nl/signalr/hubs"></script>
    <!--Add script to update the page and send messages.-->
    <script type="text/javascript">
        $(function () {
            //Set the hubs URL for the connection

            //$.connection.hub.url = "http://localhost:8080/signalr";
            $.connection.hub.url = "http://rlitest.nl/signalr";

            // Declare a proxy to reference the hub.
            var chat = $.connection.myHub;

            // Create a function that the hub can call to broadcast messages.
            chat.client.addMessage = function (name, message) {
                // Html encode display name and message.
                var encodedName = $('<div />').text(name).html();
                var encodedMsg = $('<div />').text(message).html();
                // Add the message to the page.
                $('#discussion').append('<li><strong>' + encodedName
                    + '</strong>:&nbsp;&nbsp;' + encodedMsg + '</li>');
            };
            // Get the user name and store it to prepend to messages.
            $('#displayname').val(prompt('Enter your name:', ''));
            // Set initial focus to message input box.
            $('#message').focus();
            // Start the connection.
            $.connection.hub.start({ jsonp: true }).done(function () {
                $('#sendmessage').click(function () {
                    // Call the Send method on the hub.
                    chat.server.send($('#displayname').val(), $('#message').val());
                    // Clear text box and reset focus for next comment.
                    $('#message').val('').focus();
                });
            });
        });
    </script>
</body>
</html>

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