SignalR Java 客户端 - 启动 HubConnection 时出现 NegotiationException

Question

我在 Android 项目中使用 SignalR Java Client 连接到在我的本地主机上运行的服务器（只是一个用 C# 编写的控制台应用程序）。以下是我在 Android 端的代码，在主 activity 的 onCreate 方法内。该应用程序在模拟器上运行，因此我将 URL 的本地主机部分更改为“10.0.2.2”。

try {

    AndroidPlatformComponent com = new AndroidPlatformComponent();
    Platform.loadPlatformComponent(com);

    String url = "http://10.0.2.2:8080/signalr";
    HubConnection connection = new HubConnection(url);
    HubProxy hubProxy = connection.createHubProxy("MyHub");

    connection.start().get();

    hubProxy.on("Send", new SubscriptionHandler2<String, String>() {
        @Override
        public void run(String e1, String e2) {
            Log.d("Server", e1.toString() + " -> " + e2.toString());
        }
    }, String.class, String.class);


}catch (Exception ex){
    ex.printStackTrace();
}

每次我在 connection.start().get();:

行收到以下错误

10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: java.util.concurrent.ExecutionException: microsoft.aspnet.signalr.client.transport.NegotiationException: There was a problem in the negotiation with the server
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at microsoft.aspnet.signalr.client.SignalRFuture.get(SignalRFuture.java:112)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at microsoft.aspnet.signalr.client.SignalRFuture.get(SignalRFuture.java:102)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at com.izmyr.projectx.main.MainActivity.onClick(MainActivity.java:85)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at android.view.View.performClick(View.java:4084)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at android.view.View$PerformClick.run(View.java:16966)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at android.os.Handler.handleCallback(Handler.java:615)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:92)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at android.os.Looper.loop(Looper.java:137)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:4745)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at java.lang.reflect.Method.invokeNative(Native Method)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at java.lang.reflect.Method.invoke(Method.java:511)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at dalvik.system.NativeStart.main(Native Method)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: Caused by: microsoft.aspnet.signalr.client.transport.NegotiationException: There was a problem in the negotiation with the server
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at microsoft.aspnet.signalr.client.transport.HttpClientTransport.onResponse(HttpClientTransport.java:86)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at microsoft.aspnet.signalr.client.http.java.NetworkRunnable.run(NetworkRunnable.java:82)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at java.lang.Thread.run(Thread.java:856)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: Caused by: microsoft.aspnet.signalr.client.http.InvalidHttpStatusCodeException: Invalid status code: 400
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: Response: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: <HTML><HEAD><TITLE>Bad Request</TITLE>
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: <META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii"></HEAD>
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: <BODY><h2>Bad Request - Invalid Hostname</h2>
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: <hr><p>HTTP Error 400. The request hostname is invalid.</p>
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: </BODY></HTML>
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err: Headers: [null: HTTP/1.1 400 Bad Request; ]; [Date: Wed, 14 Oct 2015 20:01:57 GMT; ]; [Content-Length: 334; ]; [X-Android-Received-Millis: 1444852816135; ]; [Connection: close; ]; [Content-Type: text/html; charset=us-ascii; ]; [Server: Microsoft-HTTPAPI/2.0; ]; [X-Android-Sent-Millis: 1444852816126; ]; 
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at microsoft.aspnet.signalr.client.transport.HttpClientTransport.throwOnInvalidStatusCode(HttpClientTransport.java:206)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     at microsoft.aspnet.signalr.client.transport.HttpClientTransport.onResponse(HttpClientTransport.java:76)
10-14 20:00:16.135 27165-27165/com.izmyr.projectx W/System.err:     ... 2 more

我试图从 onCreate 中获取代码并将其放入 AsyncTask，但它也没有用。

我需要任何一种 suggestion/solution 尽快。

编辑：以下是我的简单服务器端代码：

using System;
using Microsoft.AspNet.SignalR;
using Microsoft.Owin.Hosting;
using Owin;
using Microsoft.Owin.Cors;

namespace ConsoleApplication1
{
    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";
            using (WebApp.Start(url))
            {
                Console.WriteLine("Server running on {0}", url);

                var context = GlobalHost.ConnectionManager.GetHubContext<MyHub>();
                var key = Console.ReadLine();
                while (key != "quit")
                {
                    context.Clients.All.Send("Server", key);
                    key = Console.ReadLine();
                }
            }
        }
    }
    class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.UseCors(CorsOptions.AllowAll);
            app.MapSignalR();
        }
    }
    public class MyHub : Hub
    {
        public void Receive(string name, string message)
        {
            Console.WriteLine(name + " " + message);
        }

        public void Send(string name, string message)
        {
            Clients.All.addMessage(name, message);
        }
    }
}

Answer 1

来自您的 logcat "...原因：microsoft.aspnet.signalr.client.http.InvalidHttpStatusCodeException：无效状态代码：400..." 和 “...HTTP 错误 400。请求主机名无效...”。

所以请先检查您的服务器应用程序。从您的 PC/laptop 的网络浏览器访问 http://ip:8080/signalr（ip 是您 PC 的 IP 地址）而不是 http://localhost:8080/signalr 并查看结果。

然后，从您的 android 客户端，用该 IP 替换 10.0.2.2。

Answer 2

我通过在服务器端代码中将行 string url = "http://localhost:8080"; 替换为 string url = "http://*:8080"; 并以管理员身份运行解决了这个问题。

Answer 3

要澄清一些事情。从接受的答案中，我明白了。

第 1 步：我已经对 applicationhost.config 文件进行了更改，该文件位于 username\Documents\IISExpress\config 位置。对于年长的
第 2 步：像这个块一样查找（根据您的应用）：

<site name="SignalRChat" id="11"> <application path="/" applicationPool="Clr4IntegratedAppPool"> <virtualDirectory path="/" physicalPath="D:\Local\Experiment\SignalRAndroid\SignalRAndroid-master\Src\SignalR Server\SignalRChat" /> </application> <bindings> <binding protocol="http" bindingInformation="*:52527:localhost" /> <binding protocol="http" bindingInformation="*:52527:*" /> </bindings> </site> - 第 3 步：在绑定标记中添加以下行。 <binding protocol="http" bindingInformation="*:52527:*" />

看起来像下面的样子

<site name="SignalRChat" id="11">
            <application path="/" applicationPool="Clr4IntegratedAppPool">
                <virtualDirectory path="/" physicalPath="D:\Local\Experiment\SignalRAndroid\SignalRAndroid-master\Src\SignalR Server\SignalRChat" />
            </application>
            <bindings>
                <binding protocol="http" bindingInformation="*:52527:localhost" />
                <binding protocol="http" bindingInformation="*:52527:*" />
            </bindings>
        </site>

1.Save the applicationhost.config file.

2.Run Visual Studio in Administrator mode. (Must)

3.Change the port accordingly.

SignalR Java 客户端 - 启动 HubConnection 时出现 NegotiationException

SignalR Java Client - NegotiationException when starting HubConnection

java

android

signalr

signalr-hub

signalr.client