Socket.io Android HTTPS - Connection Error xhr poll error

Question

I'm developing a chat application with HTTPS. This is the Socket.IO I've used

Server

First of all I developed the server with node.js and node module "socket.io": "^1.4.5"

In the server I have this:

var secure = {
  ca: fs.readFileSync('ca.pem'),
  key: fs.readFileSync('key.key'),
  cert: fs.readFileSync('cert.crt')
};

var server = https.createServer(secure, app);
var io = require('socket.io')(server);

Clients

I developed the website with https://cdn.socket.io/socket.io-1.4.5.js

I developed the iOS application with pod 'Socket.IO-Client-Swift', '~> 5.5.0'

Finally I'm developing the Android application with

compile ('io.socket:socket.io-client:0.7.0') {
  exclude group: 'org.json', module: 'json'
}

In the website and in iOS application I haven't problems with the websocket, but when I try to connect the socket in Android application I receive the following error:

io.socket.engineio.client.EngineIOException: xhr poll error

Thanks

I am also getting same error in my Android app. But in my case it is only working fine in web, its not working both in iOS and Android apps. Have you found any solution? — Rizwan Sohaib, Apr 08 '16 at 17:06
@RizwanSohaib I was having the same issue. Checkout the answer on [Android Socket.io Websocket Transport does not works in SSL](http://stackoverflow.com/a/37311623/1306419). Hope it helps. — Shobhit Puri, May 18 '16 at 23:29
Now I am getting SSLPeerUnverified Error. "No Peer Certificate" — Rizwan Sohaib, May 26 '16 at 13:47
try adding IgnoreServerCertificateValidation = true to client options connection. — Rudy Hinojosa, Feb 19 '20 at 18:29

Thijs · Answer 1 · 2020-08-06T20:02:33.927

If you're trying to connect through HTTPS and use Nginx as a reverse proxy on the backend, make sure to configure the upgrade options correctly:

upstream nodes {
  # enable sticky session based on IP
  ip_hash;
  # Backend nodejs server
  server 127.0.0.1:5500;
}


server {
  listen 80;
  # The host name to respond to
  server_name mysite.com;


  location / {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $host;


    proxy_pass http://nodes;


    # enable WebSockets
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
  }
}

This worked for me in solving this mystic error.

Source: https://nhancv.com/android-socket-io-client-v1-0-0-engineioexception-xhr-poll-error/

In my case it was the correct help. Thank you a lot. – Ahmad Ebrahimi Aug 06 '20 at 19:45 — Ahmad Ebrahimi, Aug 06 '20 at 19:45

score 0 · Answer 2 · answered May 06 '16 at 19:53

This most likely a problem with your installed android version using an ssl socket protocol that your server won't accept or vice versa.

I believe this the case, because I have the same problem with Android 4.4.4 but my 5.1.1 tablet works fine.

Another instance we've seen this problem with with our OkHttpClient against a spring server where we had to extend our own DelegateSSLSocket that implements:

    @Override
    public void setEnabledProtocols(String[] protocols) {
        super.setEnabledProtocols(new String[]{TlsVersion.TLS_1_1.javaName()});
    }

So I THINK this is a very similar issue. Anyway, a work around is to update your Android OS to 5.1.1. If you find another way without updated the Android OS please let me know!

It still happens to me on Android M and Android N on Nexus 5X — Shobhit Puri, Jul 07 '16 at 22:28
Finally I use http and not https. I cannot get a solution for it — RMH, Jul 12 '16 at 06:57

Rahul Kathet · Answer 3 · 2020-01-17T18:49:09.430

-1

I hope this resolve your error:

check your authentication header you are sending from browser, iOS and android. Could because of authentication issue.

Using Socket.IO on android Always Returns XHR Poll Error

https://developer.android.com/training/articles/security-ssl

edited Jan 17 '20 at 18:49

answered Jan 17 '20 at 18:13

Rahul Kathet

135
7

Please provide answers here rather than using links. – Reza Ghorbani Jan 17 '20 at 18:40

Socket.io Android HTTPS - Connection Error xhr poll error

Server

Clients

3 Answers3