Socket.io-client-java: xhr poll error with Socket.io 1.0

[cmarrero01]

HI, I have the next error:

com.github.nkzawa.engineio.client.EngineIOException: xhr poll error

I'm not use maven and I added the jar libreries manually..

engine.io-client-0.3.0.jar
Java-WebSocket-1.3.0.jar
json-201440107.jar
socket.io-client-0.2.0.jar

This is my code on android:

       try{
        Options opts = new IO.Options();
        opts.port = 80;
        socket = IO.socket("http://192.168.0.2",opts);
        socket.connect();
        Log.i("Set Socket IO", "Socket IO Seting");
    } catch (Exception e) {
        Log.e("Socket Problem", "Try cath", e);
    }

    socket.on(Socket.EVENT_CONNECT, new Emitter.Listener() {

      @Override
      public void call(Object... args) {
        socket.emit("test", "hi");
        Log.i("Make Emit","Emit");
        socket.disconnect();
      }

    });

    socket.on("event", new Emitter.Listener() {
      @Override
      public void call(Object... args) {
          Log.i("Event","test event");
      }
    });

    socket.on(Socket.EVENT_DISCONNECT, new Emitter.Listener() {
      @Override
      public void call(Object... args) {
          Log.i("desc","error desc");
      }
    });

    socket.on(Socket.EVENT_CONNECT_ERROR , new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            //JSONObject obj = (JSONObject)args[0];
          Log.i("Error",args[0].toString());
        }
      });

    socket.on(Socket.EVENT_ERROR , new Emitter.Listener() {
        @Override
        public void call(Object... args) {
          Log.i("Error","Event Error");
        }
      });

    socket.on(Socket.EVENT_RECONNECTING , new Emitter.Listener() {
        @Override
        public void call(Object... args) {
          Log.i("Error","Event reconectiong Error");
        }
      });

This is my code of node.js:

             var _io = require('socket.io')();
    _io.listen(80);
             _io.on('connection',function(socket){
        socket.on('test',function(data,fn){
                         console.log(data);
                   });
    });

And the logcat says this:

10-28 12:29:00.772: I/Error(27117): Event reconectiong Error
10-28 12:29:00.795: I/Error(27117): com.github.nkzawa.engineio.client.EngineIOException: xhr poll error

What can I do?

[nkzawa]

The url (192.168.0.2) looks private IP address. Is this correct?

[cmarrero01]

Hi, I miss the uses permition for internet and wifi. Your library works perfectly and is awesome. :)

Thanks.

[sanakanchha]

Hi,
I have set the permissions on my pom.

I am still getting the same error.
[com.github.nkzawa.engineio.client.EngineIOException: xhr poll error]

Would this be something else?

[madhumita1]

I am also getting the same error "com.github.nkzawa.engineio.client.EngineIOException: xhr poll error"
though I have set the Internet-permissions.
How can I resolve this?

[cmarrero01]

Try to access to that IP from your phone, (ping YOUR_LOCAL_IP). from your mobile. If you can't that is the problem.

I build with this library my own Adaptor here: https://github.com/cmarrero01/socket.io-client.java I'm pretty sure that this library works perfectly, so I think is a comunication issue with your devices.

[Lir10]

Solved it by :

IO.setDefaultHostnameVerifier(new HostnameVerifier() {
@Override
public boolean verify(String hostname, SSLSession session) {
//TODO: Make this more restrictive
return true;
}
});

[cmarrero01]

You can make a PR if you want.

[vikrantkjain]

is anybody solve this issue

[nb312]

I have the same error but do not resolve it at all.

[smail2133]

same issue, I have no idea what going wrong

[SilentTheseYears]

same issue, I have no idea what going wrong

this may be the server cause. delete the pingInterval and pingTimeout.
var io = require('socket.io').listen(server, {
// pingInterval: 120000,
// pingTimeout: 60000,
logger: logger
});

https://stackoverflow.com/questions/30713635/node-js-with-socket-io-long-polling-fails-and-throws-code1-messagesessi

[danaodai951]

have try~

val opts = IO.Options()

opts.transports = arrayOf(WebSocket.NAME)

[CoolMind]

I also have this error, but on old Android devices and emulators (API 19, 21). If set opts.transports = arrayOf(WebSocket.NAME), it will lead to another error: io.socket.engineio.client.EngineIOException: websocket error.

[CoolMind]

Thanks to https://github.com/socketio/socket.io-client-java/issues/281#issuecomment-487091561 and https://stackoverflow.com/a/63395069/2914140 I wrote:

    okHttpClient = getOkHttpBuilder()
        .connectTimeout(60, TimeUnit.SECONDS)
        .readTimeout(60, TimeUnit.SECONDS)
        .writeTimeout(60, TimeUnit.SECONDS)
        // or other options.
        .build()

private fun getUnsafeOkHttpClient(): OkHttpClient.Builder =
    try {
        // Create a trust manager that does not validate certificate chains
        val trustAllCerts: Array<TrustManager> = arrayOf(
            object : X509TrustManager {
                @Throws(CertificateException::class)
                override fun checkClientTrusted(chain: Array<X509Certificate?>?,
                                                authType: String?) = Unit

                @Throws(CertificateException::class)
                override fun checkServerTrusted(chain: Array<X509Certificate?>?,
                                                authType: String?) = Unit

                override fun getAcceptedIssuers(): Array<X509Certificate> = arrayOf()
            }
        )
        // Install the all-trusting trust manager
        val sslContext: SSLContext = SSLContext.getInstance("SSL")
        sslContext.init(null, trustAllCerts, SecureRandom())
        // Create an ssl socket factory with our all-trusting manager
        val sslSocketFactory: SSLSocketFactory = sslContext.socketFactory
        val builder = OkHttpClient.Builder()
        builder.sslSocketFactory(sslSocketFactory,
            trustAllCerts[0] as X509TrustManager)
        builder.hostnameVerifier { _, _ -> true }
        builder
    } catch (e: Exception) {
        throw RuntimeException(e)
    }

private fun getOkHttpBuilder(): OkHttpClient.Builder =
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        OkHttpClient().newBuilder()
    } else {
        getUnsafeOkHttpClient()
    }

Then set socket (in another class):

private fun getOptions(): IO.Options {
    IO.setDefaultOkHttpWebSocketFactory(okHttpClient)
    IO.setDefaultOkHttpCallFactory(okHttpClient)
    return IO.Options().apply {
        forceNew = true
        reconnectionAttempts = Integer.MAX_VALUE;
        reconnection = true
        secure = true
        timeout = 1000
        transports = arrayOf(Polling.NAME, PollingXHR.NAME, WebSocket.NAME)
        query = "..."
    }
}

        val options = getOptions()
        socket = try {
            IO.socket(SOCKET_URL, options)
        ...

[Chakib-Temal]

Java Code resolve this error

try {
            IO.Options options = new IO.Options();
            options.transports = new String[]{WebSocket.NAME};
            mSocket = IO.socket("http://XXX.XXX.XX.XX:9998/", options);



            mSocket.on(Socket.EVENT_CONNECT, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.i(TAG, Socket.EVENT_CONNECT);
                }

            }).on(Socket.EVENT_DISCONNECT, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.i(TAG, Socket.EVENT_DISCONNECT);

                }
            }).on(Socket.EVENT_CONNECT_ERROR, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    String err = args[0].toString();

                    Log.i(TAG, "eroor " + err);

                }
            });


            mSocket.on("userjoinedthechat", new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    String data = (String) args[0];

                    Log.i(TAG, data);
                }

            });

            mSocket.connect();


        } catch (URISyntaxException e) {
            e.printStackTrace();
        }