Socket.io-client-java: Unable to connect using https

[anshulvij]

/_I am using node.js server side and android and another node.js client side web application.
The wep application is able to connect securely while the android application is just giving an timeout error._/

//The code for creating sslcontext
Log.d(TAG,"setupContext");
//Using a client certificate
String password = "password"
KeyStore keyStore = KeyStore.getInstance("PKCS12");
InputStream is = context.getResources().openRawResource(R.raw.client_crt);
keyStore.load(is, password.toCharArray());
is.close();

    KeyManagerFactory kmf = KeyManagerFactory.getInstance("X509");
    kmf.init(keyStore, password.toCharArray());
    KeyManager[] keyManagers = kmf.getKeyManagers();

    // Load CAs from an InputStream
    // (could be from a resource or ByteArrayInputStream or ...)
    CertificateFactory cf = CertificateFactory.getInstance("X.509");
    // Using self signed certificate
    is = context.getResources().openRawResource(R.raw.cacert);
    InputStream caInput = new BufferedInputStream(is);
    Certificate ca;
    ca = cf.generateCertificate(caInput);
    Log.i(TAG,"ca=" + ((X509Certificate) ca).getSubjectDN());
    caInput.close();


    // Create a KeyStore containing our trusted CAs
    KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
    trustStore.load(null);
    trustStore.setCertificateEntry("ca", ca);

    // Create a TrustManager that trusts the CAs in our KeyStore
    TrustManagerFactory tmf = TrustManagerFactory.getInstance("X509");
    tmf.init(trustStore);
    TrustManager[] trustManagers =  tmf.getTrustManagers();

    // Create an SSLContext that uses our TrustManager
    SSLContext sslcontext = SSLContext.getInstance("TLS");

    sslcontext.init(keyManagers, trustManagers, null);

    IO.Options opts = new IO.Options();
    opts.forceNew = true;
    opts.reconnection = false;
    opts.sslContext = mSslContext;
    opts.secure=true;
    mSocket = IO.socket("https://" + mIpAddress + ":" + mPort+"/", opts);
    mSocket.connect();
    mSocket.on(Socket.EVENT_CONNECT, mConnectionListener);
    mSocket.on(Socket.EVENT_DISCONNECT,mDisconnectionListener);
    mSocket.on(Socket.EVENT_ERROR,mErrorListener);
    mSocket.on(Socket.EVENT_MESSAGE,mMessageListener);
    mSocket.on(Socket.EVENT_CONNECT_ERROR,mConnectionErrorListener);

     // I never get call for EVENT_CONNECT

///////////////////////////SERVER CODE///////////////////////////////////////////////
var privateKey = fs.readFileSync('certificates/server.key').toString();
var certificate = fs.readFileSync('certificates/server.crt').toString();
var ca = fs.readFileSync('certificates/cacert.pem').toString();
// Sending and receiving events with Socket.IO
var app = express();
https.globalAgent.options.rejectUnauthorized = false;
var server = https.createServer({key:privateKey,cert:certificate,ca:ca },app);
// var server = require('http').Server(app);
exports.io = require('./sockets').listen(server);
//Server is listening on port 3000

Please tell a way to enable logs in android app for socket.io and possible cause of this problem.
There is no activity in node.js terminal as if the socket never got a call after using https it work fine if I use http
Thanks and regards,
Anshul

[nkzawa]

Umm, I'm not sure what the problem is, but it may be helpful to compare with my settings for unit tests.

https://github.com/nkzawa/socket.io-client.java/blob/master/src/test/java/com/github/nkzawa/socketio/client/SSLConnectionTest.java#L51

Set the log level FINE or lower to see all logs.

[mifoss]

i have the same Problem. I have created a self-sigend certifcate but socketio won't connect to my server...

When i listen to the "EVENT_CONNECT_ERROR" Event i get the following ErrorMessage:

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

------------- ServerCode ( Snippet ) -------------

express = require('express'),
app = express(),
https = require('https').createServer({
    key: fs.readFileSync('server.key'),
    cert: fs.readFileSync('server.crt'),
    ca: fs.readFileSync('server.csr'),
}, app);
io = require('socket.io')(https);

https.listen(config.port, function() {
    console.log('Listening on Port %d', config.port);
});

Java-Client:

IO.Options options = new IO.Options();
try {
    options.sslContext = createSSLContext();
} catch (GeneralSecurityException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}
options.secure = true;

TokenManager tokenManager = new TokenManager(); 
String token = tokenmanager.getToken();

socket = IO.socket(Globals.HOST + "/?token=" + token, options);

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

@Override
public void call(Object... args) {
     Log.d("SOCKETIO", "CONNECTED");
    startMessageListener(socket);
}

});

public SSLContext createSSLContext() throws GeneralSecurityException, IOException {
    Security.insertProviderAt(new BouncyCastleProvider(), 1);

    try {
        TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {
            @Override
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return null;
            }

            @Override
            public void checkClientTrusted(X509Certificate[] certs, String authType) {
            }

           @Override
           public void checkServerTrusted(X509Certificate[] certs, String authType) {
           }
       } 

       // Install the all-trusting trust manager
       SSLContext sc = SSLContext.getInstance("SSL");
       sc.init(null, trustAllCerts, new java.security.SecureRandom()); 
       return sc;

    } catch (Exception exception) {
        exception.printStackTrace();
    }
    return null;
}

If i use this code for http-Requets everything works fine

[kosch]

I think the problem is maybe related to host name verification. Try to set the

HttpsURLConnection.setDefaultHostnameVerifier(new RelaxedHostNameVerifier());
...
    public static class RelaxedHostNameVerifier implements HostnameVerifier {
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    }

Unfortunality such exceptions are not logged. I suggest to add logging at Request.onError including the exception stack.
Maybe you can add the HostNameVerified as additional Option too.

[feromakovi]

Hello, I'm using this library too for connecting to server. Connection to server is secured too.
But in my case I creates SSLContext which should accept all certificates like this:

    private TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
            return new java.security.cert.X509Certificate[] {};
        }

        public void checkClientTrusted(X509Certificate[] chain,
                                       String authType) throws CertificateException {
        }

        public void checkServerTrusted(X509Certificate[] chain,
                                       String authType) throws CertificateException {
        }
    } };

    public static class RelaxedHostNameVerifier implements HostnameVerifier {
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    }

and in code I set it up:

    SSLContext sc = SSLContext.getInstance("TLS");
            sc.init(null, trustAllCerts, new SecureRandom());
            IO.setDefaultSSLContext(sc);
            HttpsURLConnection.setDefaultHostnameVerifier(new RelaxedHostNameVerifier());

and I create custom IO.Options:

    IO.Options options = new IO.Options();
            options.sslContext = sc;
            options.secure = true;
            options.port = 443;

and for establishing connection I use this code, maybe very similar as the code from samples:

 Socket socket = IO.socket("https://before.host.com", options);
            socket.on(Socket.EVENT_CONNECT, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.d(TAG, "eventConnect");
                }
            }).on(Socket.EVENT_MESSAGE, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.d(TAG, "eventMessage");
                }
            }).on(Socket.EVENT_DISCONNECT, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.d(TAG, "eventDisconnect");
                }
            }).on(Socket.EVENT_CONNECT_ERROR, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.d(TAG, "eventConnectError");
                    for(Object o : args){
                        Log.d(TAG, "object: " + o.toString());
                        if(o instanceof SocketIOException)
                            ((SocketIOException) o).printStackTrace();
                    }
                }
            }).on(Socket.EVENT_ERROR, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.d(TAG, "eventError");
                }
            });
            socket.connect();

And this instantly gives me an Exception, the same as in previous cases:

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

And if I create my own server app, unsecured with scheme - http, on my private network, everything works. Is it problem on client side (me) or server side?
Thank you for your advices!

[crossle]

How about https connect?

[jonathanve]

Hi @feromakovi and @crossle I was able to communicate from my android phone via ssl. Here it is the project I setup for you guys to try it out.

https://github.com/jonathanve/socket-io-android

Hope it helps.

[jonathanve]

I wrote the code inside my application class. Anywhere else where should I locate it instead?

[jonathanve]

@nkzawa ?

[nkzawa]

@jonathanve what's your problem?

[nkzawa]

@jonathanve btw, thank you for your great example app :+1:

[jonathanve]

hi @nkzawa , thank you. Hope the example helps somebody so this issue can be closed

[madhumita1]

@nkzawa ,@jonathanve

how to handle for "https" connections?

[j54n1n]

Hello,
I'm also trying to use https connection on my Android client but I get either the dreaded xhr poll error on JellyBean+ or a strange semi working behaviour on Gingerbread or IceCreamSandwich.

I've running on a Raspberry Pi a simple node.js app that runs Express to serve a webpage embedded with the client side socket.io script.

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <script src="/socket.io/socket.io.js"></script>
</head>
<body>
<h1>Content of the document</h1>
<script>
var div = document.createElement('div');
var socket = io.connect('https://raspberrypi/');
socket.on('secure_data', function(secure_data) {
  console.log(secure_data);
  var p = document.createElement('p');
  p.appendChild(document.createTextNode('' + secure_data));
  document.body.appendChild(p);
});
</script>
</body>
</html>

and with the https server app

var fs       = require('fs');
var https    = require('https');
var express  = require('express');
var socketio = require('socket.io');

var port = 443;
var app  = express();

var server = https.createServer({
        key: fs.readFileSync('server.key'),
        cert: fs.readFileSync('server.crt')
}, app).listen(port, function() {
        console.log('Listening on *:' + port);
});

app.use(express.static(__dirname + '/public'));

var io = socketio(server);

io.on('connection', function(socket) {
        setInterval(function() {
                socket.emit('secure_data', { hello: 'secure_world' });
        }, 1000);
});

I'm generating the keys and ca with a script via openssl

#!/bin/bash
openssl genrsa -des3 -passout pass:x -out server.pass.key 2048
openssl rsa -passin pass:x -in server.pass.key -out server.key
rm server.pass.key
# When the openssl req command asks for a "challenge password",
# just press return, leaving the password empty.
openssl req -new -key server.key -out server.csr
# Generate SSL certificate.
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

then I copied the .crt file to my Android Studio project and tried to load the self signed certificate as mentioned in the docs of Android.
https://developer.android.com/training/articles/security-ssl.html#UnknownCa

private void getSocketIO() {
        final String uri = "https://raspberrypi/";
        try {
            // Load CAs from an InputStream.
            CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
            Certificate certificate = certificateFactory.generateCertificate(
                    getResources().openRawResource(R.raw.server)); // from file server.crt
            // Create a KeyStore containing the trusted CAs.
            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
            keyStore.load(null, null);
            keyStore.setCertificateEntry("ca", certificate);
            // Create a TrustManager that trusts the CAs in KeyStore.
            TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(
                    TrustManagerFactory.getDefaultAlgorithm());
            trustManagerFactory.init(keyStore);
            // Create an SSLContext that uses the TrustManager.
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, trustManagerFactory.getTrustManagers(), null);
            Log.i(uri, "sslContext created");
            //
            // Try to open url.
            URL url = new URL(uri);
            final HttpsURLConnection httpsURLConnection = (HttpsURLConnection) url.openConnection();
            httpsURLConnection.setSSLSocketFactory(sslContext.getSocketFactory());
            httpsURLConnection.setHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String hostname, SSLSession session) {
                    Log.i("HostnameVerifier", "Approving certificate for " + hostname);
                    return true; // Do nothing.
                }
            });
            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        BufferedReader in = new BufferedReader(new InputStreamReader(
                                httpsURLConnection.getInputStream()));
                        Log.i("httpsURLConnection", "url connected");
                        String line; //FIXME: readLine kicks in socket.io at least on gingerbread!?
                        while((line = in.readLine()) != null) {
                            Log.i("httpsURLConnection", line);
                        }
                        in.close();
                    } catch (IOException e) {
                    }
                }
            }).start();
            //
            // Try to use socket.io library.
            IO.setDefaultSSLContext(sslContext);
            IO.Options options = new IO.Options();
            options.secure = true;
            options.sslContext = sslContext;
            Socket socket = IO.socket(uri, options);
            socket.on(Socket.EVENT_CONNECT_ERROR, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    for(Object o : args) {
                        Log.i("IO " + Socket.EVENT_CONNECT_ERROR, o.toString());
                    }
                }
            }).on(Socket.EVENT_CONNECT_TIMEOUT, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.i("IO", Socket.EVENT_CONNECT_TIMEOUT);
                }
            }).on(Socket.EVENT_CONNECT, new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.i("IO", Socket.EVENT_CONNECT);
                }
            }).on("secure_data", new Emitter.Listener() {
                @Override
                public void call(Object... args) {
                    Log.i("IO secure_data", args[0].toString());
                }
            });
            socket.connect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

First thing was to add

<uses-permission android:name="android.permission.INTERNET"/>

in the manifest file.

To be sure that the certificate part was working I added the code to open a https connection and I printed out in the log the content of the html file. That worked fine without problems. But in the part of your socket.io library I got only "com.github.nkzawa.engineio.client.EngineIOException: xhr poll error" at least from JellyBean till Lollipop.

In another way Gingebread and ICS had a different behaviour: the socket.io library connected to the server without problems but only if I left the code inplace that was reading from the https input stream.
My wild guess would be that the javascript inside from the html file gets executed in some way and then kicks in the java socket.io library!?

I'm attaching the logs that I made:

From JellyBean till Lollipop

01-14 16:14:22.716    2654-2654/it.js.ssocketio I/https://raspberrypi/﹕ sslContext created
...
01-14 16:14:22.900    2654-2669/it.js.ssocketio I/HostnameVerifier﹕ Approving certificate for raspberrypi
...
01-14 16:14:23.022    2654-2678/it.js.ssocketio I/IO connect_error﹕ com.github.nkzawa.engineio.client.EngineIOException: xhr poll error
01-14 16:14:23.027    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ url connected
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ <!DOCTYPE html>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ <html>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ <head>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ <meta charset="UTF-8">
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ <title>Title</title>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ <script src="/socket.io/socket.io.js"></script>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ </head>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ <body>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ <h1>Content of the document</h1>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ <script>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ var div = document.createElement('div');
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ var socket = io.connect('https://raspberrypi/');
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ socket.on('secure_data', function(secure_data) {
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ console.log(secure_data);
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ var p = document.createElement('p');
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ p.appendChild(document.createTextNode('' + secure_data));
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ document.body.appendChild(p);
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ });
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ </script>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ </body>
01-14 16:14:23.292    2654-2669/it.js.ssocketio I/httpsURLConnection﹕ </html>
...
01-14 16:14:24.063    2654-2683/it.js.ssocketio I/IO connect_error﹕ com.github.nkzawa.engineio.client.EngineIOException: xhr poll error
01-14 16:14:26.092    2654-2687/it.js.ssocketio I/IO connect_error﹕ com.github.nkzawa.engineio.client.EngineIOException: xhr poll error
...

$ sudo DEBUG=* node index.js
  express:application compile etag weak +0ms
  express:application compile query parser extended +46ms
  express:application compile trust proxy false +9ms
  express:application booting in development mode +7ms
  express:router use / query +277ms
  express:router:layer new / +5ms
  express:router use / expressInit +11ms
  express:router:layer new / +2ms
  express:router use / serveStatic +5ms
  express:router:layer new / +1ms
  socket.io:server initializing namespace / +0ms
  socket.io:server creating engine.io instance with opts {"path":"/socket.io"} +53ms
  socket.io:server attaching client serving req handler +45ms
Listening on *:443
  express:router dispatching GET / +22s
  express:router query  : / +29ms
  express:router expressInit  : / +9ms
  express:router serveStatic  : / +7ms
  send stat "/home/pi/secure-webapp/public/index.html" +27ms
  send pipe "/home/pi/secure-webapp/public/index.html" +20ms
  send modified Wed, 14 Jan 2015 15:34:02 GMT +11ms
  send etag W/"203-3867020799" +12ms
  send content-type text/html +6ms

For Gingerbread and ICS

01-14 16:31:27.709    1795-1795/it.js.ssocketio I/https://raspberrypi/﹕ sslContext created
...
01-14 16:31:27.869    1795-1815/it.js.ssocketio I/IO connect_error﹕ com.github.nkzawa.engineio.client.EngineIOException: xhr poll error
...
01-14 16:31:27.909    1795-1809/it.js.ssocketio I/HostnameVerifier﹕ Approving certificate for raspberrypi
01-14 16:31:27.949    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ url connected
...
01-14 16:31:28.179    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ <!DOCTYPE html>
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ <html>
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ <head>
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ <meta charset="UTF-8">
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ <title>Title</title>
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ <script src="/socket.io/socket.io.js"></script>
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ </head>
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ <body>
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ <h1>Content of the document</h1>
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ <script>
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ var div = document.createElement('div');
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ var socket = io.connect('https://raspberrypi/');
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ socket.on('secure_data', function(secure_data) {
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ console.log(secure_data);
01-14 16:31:28.189    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ var p = document.createElement('p');
01-14 16:31:28.199    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ p.appendChild(document.createTextNode('' + secure_data));
01-14 16:31:28.199    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ document.body.appendChild(p);
01-14 16:31:28.199    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ });
01-14 16:31:28.199    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ </script>
01-14 16:31:28.199    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ </body>
01-14 16:31:28.199    1795-1809/it.js.ssocketio I/httpsURLConnection﹕ </html>
...
01-14 16:31:28.949    1795-1825/it.js.ssocketio I/IO﹕ connect
01-14 16:31:30.009    1795-1828/it.js.ssocketio I/IO secure_data﹕ {"hello":"secure_world"}
01-14 16:31:30.939    1795-1831/it.js.ssocketio I/IO secure_data﹕ {"hello":"secure_world"}
...

$ sudo DEBUG=* node index.js
  express:application compile etag weak +0ms
  express:application compile query parser extended +46ms
  express:application compile trust proxy false +9ms
  express:application booting in development mode +7ms
  express:router use / query +277ms
  express:router:layer new / +5ms
  express:router use / expressInit +11ms
  express:router:layer new / +2ms
  express:router use / serveStatic +5ms
  express:router:layer new / +1ms
  socket.io:server initializing namespace / +0ms
  socket.io:server creating engine.io instance with opts {"path":"/socket.io"} +53ms
  socket.io:server attaching client serving req handler +45ms
Listening on *:443
  express:router dispatching GET / +45s
  express:router query  : / +30ms
  express:router expressInit  : / +9ms
  express:router serveStatic  : / +6ms
  send stat "/home/pi/secure-webapp/public/index.html" +27ms
  send pipe "/home/pi/secure-webapp/public/index.html" +73ms
  send modified Wed, 14 Jan 2015 15:34:02 GMT +11ms
  send etag W/"203-3867020799" +12ms
  send content-type text/html +6ms
  engine intercepting request for path "/socket.io/" +0ms
  engine handling "GET" http request "/socket.io/?EIO=3&transport=polling" +14ms
  engine handshaking client "P7_8gm23I5Ol-7UBAAAA" +60ms
  engine:socket sending packet "open" ({"sid":"P7_8gm23I5Ol-7UBAAAA","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":60000}) +22ms
  engine:polling setting request +19ms
  engine:socket flushing buffer to transport +3ms
  engine:polling writing "      �0{"sid":"P7_8gm23I5Ol-7UBAAAA","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":60000}" +33ms
  engine:socket executing batch send callback +21ms
  socket.io:server incoming connection with id P7_8gm23I5Ol-7UBAAAA +45s
  socket.io:client connecting to namespace / +0ms
  socket.io:namespace adding socket to nsp / +0ms
  socket.io:socket socket connected - writing packet +0ms
  socket.io:socket joining room P7_8gm23I5Ol-7UBAAAA +3ms
  socket.io:client writing packet {"type":0,"nsp":"/"} +48ms
  socket.io-parser encoding packet {"type":0,"nsp":"/"} +0ms
  socket.io-parser encoded {"type":0,"nsp":"/"} as 0 +4ms
  engine:socket sending packet "message" (0) +77ms
  socket.io:socket joined room P7_8gm23I5Ol-7UBAAAA +33ms
  engine intercepting request for path "/socket.io/" +19ms
  engine handling "GET" http request "/socket.io/?EIO=3&sid=P7_8gm23I5Ol-7UBAAAA&transport=polling" +2ms
  engine setting new request for existing client +6ms
  engine:polling setting request +2ms
  engine:socket flushing buffer to transport +3ms
  engine:polling writing "�40" +5ms
  engine:socket executing batch send callback +9ms
  engine intercepting request for path "/socket.io/" +30ms
  engine handling "GET" http request "/socket.io/?EIO=3&sid=P7_8gm23I5Ol-7UBAAAA&transport=polling" +2ms
  engine setting new request for existing client +4ms
  engine:polling setting request +2ms
  socket.io:client writing packet {"type":2,"data":["secure_data",{"hello":"secure_world"}],"nsp":"/"} +1s
  socket.io-parser encoding packet {"type":2,"data":["secure_data",{"hello":"secure_world"}],"nsp":"/"} +1s
  socket.io-parser encoded {"type":2,"data":["secure_data",{"hello":"secure_world"}],"nsp":"/"} as 2["secure_data",{"hello":"secure_world"}] +3ms
  engine:socket sending packet "message" (2["secure_data",{"hello":"secure_world"}]) +950ms
  engine:socket flushing buffer to transport +2ms
  engine:polling writing "�42["secure_data",{"hello":"secure_world"}]" +3ms
  engine intercepting request for path "/socket.io/" +25ms
  engine handling "GET" http request "/socket.io/?EIO=3&sid=P7_8gm23I5Ol-7UBAAAA&transport=polling" +2ms
  engine setting new request for existing client +3ms
  engine:polling setting request +2ms
  engine:socket executing batch send callback +2ms
  socket.io:client writing packet {"type":2,"data":["secure_data",{"hello":"secure_world"}],"nsp":"/"} +1s
  socket.io-parser encoding packet {"type":2,"data":["secure_data",{"hello":"secure_world"}],"nsp":"/"} +1s
  socket.io-parser encoded {"type":2,"data":["secure_data",{"hello":"secure_world"}],"nsp":"/"} as 2["secure_data",{"hello":"secure_world"}] +2ms
  engine:socket sending packet "message" (2["secure_data",{"hello":"secure_world"}]) +1s
  engine:socket flushing buffer to transport +2ms
  engine:polling writing "�42["secure_data",{"hello":"secure_world"}]" +3ms
  engine intercepting request for path "/socket.io/" +99ms
  engine handling "GET" http request "/socket.io/?EIO=3&sid=P7_8gm23I5Ol-7UBAAAA&transport=polling" +2ms
  engine setting new request for existing client +3ms
  engine:polling setting request +2ms
  engine:socket executing batch send callback +2ms
  socket.io:client writing packet {"type":2,"data":["secure_data",{"hello":"secure_world"}],"nsp":"/"} +1s
  socket.io-parser encoding packet {"type":2,"data":["secure_data",{"hello":"secure_world"}],"nsp":"/"} +1s
  socket.io-parser encoded {"type":2,"data":["secure_data",{"hello":"secure_world"}],"nsp":"/"} as 2["secure_data",{"hello":"secure_world"}] +2ms
  engine:socket sending packet "message" (2["secure_data",{"hello":"secure_world"}]) +923ms
  engine:socket flushing buffer to transport +1ms
  engine:polling writing "�42["secure_data",{"hello":"secure_world"}]" +3ms
...

No clue if I missed something else!?

[j54n1n]

Ok that was fast xD.
In the end it was something that I missed in the code.
The line after IO.setDefaultSSLContext() you have to put

            HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }
            });

or provide your own implementation of the HostnameVerifier interface. Pay attention that this is the global setting via the static method HttpsURLConnection#setDefaultHostnameVerifier. Maybe it should be mentioned in the readme?

[hgshoggins]

Hello,

On my side, everything is good until Android Lollipop : stumbled accross a "timeout" SocketIOException, and I can't figure out why.

Any ideas ?

[wingoku]

@hgshoggins Did you find any solutions for TimeOut issue on Lollipop devices? My code is working fine on pre lollipop devices but on lollipop it is giving me timeout issue.

[hgshoggins]

Hello @wingoku. No luck on my side, I had to use plain text on my ws, and make sure I was not transporting any sensitive data.

I first wanted to use it because in plain HTTP, some GSM BTS mangle the content sent by a Device : I got myself with some strange X-NOKIA-xxxx headers that I did not want to be added, that is why I preferred to use HTTPS.

[nkzawa]

Can you try just released v0.5.0 which the websocket transport is replaced with OkHttp ?

[najeebullahshah]

@j54n1n great man, your's is the best solution on the issue of https connection.

[shuoli84]

I am using this with HTTPS and it requires no hacking or workaround. Using v0.5.1.

@anshulvij @nkzawa is it ok to close this?

[therockorchid]

@shuoli84 ,
can you share your connection code? Perhaps that would help me figure out what I am doing wrong? Coz I am having the same issue as mentioned above by @j54n1n

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

I am using v0.5.2

[marekyggdrasil]

I was also having xhr poll error, what resolved the issue was:
@jonathanve code and also updating socket.io library from v0.3.0 to v0.6.2. I did not establish SSL security within node.js like @j54n1n suggested, instead I defined them in my nginx server configuration.

[wpq2014]

@jonathanve Did you deleted https://github.com/jonathanve/socket-io-android?

[jonathanve]

@wpq2014 yes, let me restore it then. Since no comments were posted since October 2015, I thought It was not longer needed.

[dominguesr]

@marekyggdrasil could you please explain how you did it on Nginx? We have a similar situation and we haven't been able to figure out how to fix it. thanks

[HeartIsBeat]

I cause the problem, just use code

When "io.socket.engineio.client.EngineIOException: xhr poll error" is appeared，for I use emit method's second param is String not JSONObject.
Connect to socket.io server use java api caused me one day! O my god.