在 android 上使用 Socket.IO 总是返回 XHR 轮询错误 [英] Using Socket.IO on android Always Returns XHR Poll Error

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本文介绍了在 android 上使用 Socket.IO 总是返回 XHR 轮询错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在编写一个需要连接到在 node.js 服务器上运行的 Socket.IO 实例的 android 应用程序.

I am writing an android app that needs to connect to a Socket.IO instance running on a node.js server.

尝试连接到实例并使用 iOS 设备传输数据完美无缺，但是当我尝试使用 Android 设备执行此操作时却失败了.

Attempting to connect to the instance and transmitting data using an iOS device works flawlessly, but when I try to do it with an android device it fails.

我正在使用 本机 java 客户端，这是我的代码在安卓端使用:

I am using the Native java client, and this is the code I'm using on the android side:

mManager = new Manager(new URI("https://example.com"));
mSocket = mManager.socket("/users");

// socket events listeners
    mSocket.on(Socket.EVENT_CONNECTING, new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            Log.v(TAG, "Caught EVENT_CONNECTING");
            for (Object obj : args) {
                Log.v(TAG, "Errors :: " + obj);
            }
        }
    }).on(Socket.EVENT_CONNECT, new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            Log.v(TAG, "connected to the backend");
            Log.v(TAG, String.format("JSON Obj to emit: %s", jsonObject.toString()));
            mSocket.emit("hello_packet", jsonObject);
        }
    }).on(Socket.EVENT_RECONNECTING, new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            Log.v(TAG, "Caught EVENT_RECONNECTING");
            for (Object obj : args) {
                Log.v(TAG, "Errors :: " + obj);
            }
        }
    }).on(Socket.EVENT_DISCONNECT, new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            Log.v(TAG, "Socket disconnected");
        }
    }).on(Socket.EVENT_ERROR, new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            Log.v(TAG, "Caught EVENT_ERROR");
            for (Object obj : args) {
                Log.v(TAG, "Errors :: " + obj);
            }
        }
    }).on(Socket.EVENT_CONNECT_ERROR, new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            Log.v(TAG, "Caught EVENT_CONNECT_ERROR");
            for (Object obj : args) {
                Log.v(TAG, "Errors :: " + obj);
            }
        }
    });

    Log.v(TAG, "Connecting socket");
    mSocket.connect();

每当我尝试连接时(基本上只要行 mSocket.connect();)日志就会打印以下几行:

Whenever I try to connect (Basically as soon as the line mSocket.connect();) The log prints the following lines:

05-07 22:41:36.684 15552-15552/com.my.app V/Main Activity: Connecting socket
05-07 22:41:36.699 15552-15858/com.my.app V/Main Activity: Caught EVENT_CONNECTING
05-07 22:41:36.926 15552-15866/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:41:36.926 15552-15866/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:41:38.189 15552-15884/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:41:38.189 15552-15884/com.my.app V/Main Activity: Errors :: 1
05-07 22:41:38.207 15552-15887/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:41:38.208 15552-15887/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:41:39.518 15552-15911/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:41:39.518 15552-15911/com.my.app V/Main Activity: Errors :: 2
05-07 22:41:39.531 15552-15915/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:41:39.531 15552-15915/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:41:41.846 15552-15949/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:41:41.846 15552-15949/com.my.app V/Main Activity: Errors :: 3
05-07 22:41:41.857 15552-15953/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:41:41.857 15552-15953/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:41:46.863 15552-16025/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:41:46.864 15552-16025/com.my.app V/Main Activity: Errors :: 4
05-07 22:41:46.879 15552-16029/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:41:46.879 15552-16029/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:41:51.883 15552-16126/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:41:51.883 15552-16126/com.my.app V/Main Activity: Errors :: 5
05-07 22:41:51.895 15552-16130/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:41:51.895 15552-16130/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:41:56.900 15552-16236/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:41:56.900 15552-16236/com.my.app V/Main Activity: Errors :: 6
05-07 22:41:56.921 15552-16240/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:41:56.921 15552-16240/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:42:01.927 15552-16357/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:42:01.927 15552-16357/com.my.app V/Main Activity: Errors :: 7
05-07 22:42:01.945 15552-16361/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:42:01.945 15552-16361/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:42:06.951 15552-16466/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:42:06.952 15552-16466/com.my.app V/Main Activity: Errors :: 8
05-07 22:42:06.969 15552-16470/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:42:06.970 15552-16470/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:42:11.975 15552-16545/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:42:11.976 15552-16545/com.my.app V/Main Activity: Errors :: 9
05-07 22:42:11.994 15552-16549/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:42:11.994 15552-16549/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:42:17.000 15552-16629/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:42:17.000 15552-16629/com.my.app V/Main Activity: Errors :: 10
05-07 22:42:17.012 15552-16633/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:42:17.012 15552-16633/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:42:22.017 15552-16710/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:42:22.017 15552-16710/com.my.app V/Main Activity: Errors :: 11
05-07 22:42:22.033 15552-16714/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:42:22.033 15552-16714/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:42:27.039 15552-16788/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:42:27.039 15552-16788/com.my.app V/Main Activity: Errors :: 12
05-07 22:42:27.056 15552-16792/com.my.app V/Main Activity: Caught EVENT_CONNECT_ERROR
05-07 22:42:27.056 15552-16792/com.my.app V/Main Activity: Errors :: io.socket.engineio.client.EngineIOException: xhr poll error
05-07 22:42:32.061 15552-16957/com.my.app V/Main Activity: Caught EVENT_RECONNECTING
05-07 22:42:32.062 15552-16957/com.my.app V/Main Activity: Errors :: 13

所以我在尝试连接后立即收到 xhr 轮询错误，并且随后的所有连接尝试都遇到相同的结果.

So I immediately get an xhr poll error after attempting to connect and all following connection attempts meet the same result.

我看到一些帖子说这样的问题可能是由 SSL 证书问题引起的，尽管我为调整 Socket.IO 库使用的 SSL 上下文所做的任何尝试都没有奏效.

I saw some posts saying such an issue might be cause by an SSL certificate issue though any attempts I made to temper with the SSL Context the Socket.IO library uses didn't work.

如果有人知道我可以尝试使其工作的想法，那就太好了.

If anyoen has an idea what I might be able to try to get this to work it would be excellent.

如果缺少任何信息或代码示例，请告诉我，我会添加它们.

If any information or code sampels are missing, let me know and I'll add them.

推荐答案

经过进一步测试，我发现了以下内容:

After further testing I found the following:

  1. 如果您在遇到不同的事件(即 EVENT_ERROR)时调试套接字，您捕获的异常将包含从您尝试访问的地址收到的响应代码.
  2. 在我尝试使用 HTTP 访问我的服务器时，我收到了 301 响应代码，因为我尝试访问的 URL 自动将我重定向到 HTTPS 地址.
  3. 在尝试访问 HTTPS 地址时，我收到了 401 响应代码 - 这意味着我的套接字发出的请求已到达服务器但未获得授权 - 原因是目标服务器已打开了基本身份验证 并且我没有在套接字请求标头中提供所需的凭据.
  4. 在提供所需的标头后，我设法正确连接到套接字服务器，但是在发送请求时它失败了，我的套接字返回到重新连接尝试循环 - 原因是我发送到的 JSON我的 Android 手机上的服务器不是预期的格式，服务器未能收到该请求.
  1. If you debug your socket when you encounter different events (i.e. EVENT_ERROR), the exception you catch will contain the response code received from the address you tried to reach.
  2. In my case when attempting to reach my server with HTTP I received a 301 response code because the URL I tried reaching automatically redirected me to the HTTPS address.
  3. When attempting to reach the HTTPS address I received a 401 response code - meaning the request my socket made had reached the server but was not authorized - The reason for that was that the target server had basic authentication turned on and I didn't supply the required credentials in the socket request headers.
  4. After supplying the required headers I managed to connect to the socket server properly, but when sending out a request it failed and my socket went back to a re-connection attempt loop - The reason for that was that the JSON I sent to the server from my Android phone was not in the format expected and the server failed to receive that request.

我用来向套接字请求添加基本身份验证标头的代码:

The code I used to add a basic authentication header to my socket request:

// Adding authentication headers when encountering EVENT_TRANSPORT
mSocket.io().on(Manager.EVENT_TRANSPORT, new Emitter.Listener() {
    @Override
    public void call(Object... args) {
        Transport transport = (Transport) args[0];
        // Adding headers when EVENT_REQUEST_HEADERS is called
        transport.on(Transport.EVENT_REQUEST_HEADERS, new Emitter.Listener() {
            @Override
            public void call(Object... args) {
                Log.v(TAG, "Caught EVENT_REQUEST_HEADERS after EVENT_TRANSPORT, adding headers");
                Map<String, List<String>> mHeaders = (Map<String, List<String>>)args[0];
                mHeaders.put("Authorization", Arrays.asList("Basic bXl1c2VyOm15cGFzczEyMw=="));
            }
        });
    }
});

如果在尝试使用 Socket.IO 时遇到 XHR Poll 错误，请确保与套接字服务器的连接可用并且连接正确.最后，在我的情况下，这一切都围绕着需要基本身份验证的服务器，而我在联系服务器时没有提供它.

If you encounter and XHR Poll error when you attempt to use Socket.IO, make sure that the connection to your socket server is available and that you are connecting properly. In the end in my case it all revolved around the server requiring basic authentication and me not supplying it when contacting the server.

另外，因为我在尝试解决此问题时遇到了一些解决方案 - 当尝试通过 HTTPS 访问您的服务器时，您通常不需要特殊主机名验证器或特殊证书管理器.尽量避免使用此类解决方案，因为它们会严重损害您应用的安全性.

Also, because I encountered that solution qutie a bit while trying to sovle this issue - When trying to reach your server over HTTPS, you usually don't need a special hostname verifier or special certificate manager. Try and avoid such solutions as they greatly harm the security of your app.

这篇关于在 android 上使用 Socket.IO 总是返回 XHR 轮询错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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