I am doing an API and it's on Heroku. But I am having some problems with the socket.io only on the heroku side, when I test it in local everything goes fine. The API is completely independent of the frontend, so they are in a different domains (and a different hosts). The problem is that on production, I don't get succeed in connect the sockets...

I have some questions, all of that are about the socket.io configuration on heroku. I know that there are some posts with some information about that, but the posts I found it was with old versions of sockets.io or old versions of heroku (heroku seems to has changed the websockets stuff the past July):

• I don't know if I need to activate something before run socket.io on heroku. I read some posts about that, but all seems to be old... I tried to activate Websockets with: $ heroku labs:enable websockets but the response that I got it was: ! No such feature: websockets.




• Do I have to specify a port, or Heroku has an automatic port for that?




• Do I need two connections? One to listen the POST/GET/PUT/DELETE and another to the sockets?

app.js

    var express = require('express');

    var app = module.exports = express();

    var port = process.env.PORT || 5000;

    var port_s = 3000;

    var server = require('http').createServer(express);

    ...

    app.listen(port);

    server.listen(port_s);



    require('./config/socket-io')(app, server, secret);

    app.post('/user', routes.users.register);

    ...

socket-io.js

module.exports = function(app, server, secret) {

    var clients = {};

    console.log(initiating sockets...);

    var sio = require('socket.io').listen(server);



    sio.sockets.on('connection', function (socket) {

        clients[socket.id] = socket;

        console.log(...new connection: +socket.client.id);

        socket.emit('identification', { data : socket.client.id });



        socket.on('newShoutOut', function(data) {

            var receptor    = data.idTo;

            var emiter      = socket.client.id;

            //console.log(...new shout out from  +emiter+  to +receptor);

            var elem = findElement(sio.sockets['sockets'], 'id', receptor);

            sio.sockets.sockets[elem].emit('privateShoutout',{ data : data.data, from : emiter });

        });



        socket.on('disconnect', function() {

            //console.log(...+socket.client.id +  disconnected);

        });

    });

};



function findElement(arr, propName, propValue) {

    for (var i=0; i < arr.length; i++) {

        if (arr[i].id === propValue)

            return i;

    };

}

I repeat, everything works on localhost. I tried the API on localhost:5000 and the client app on localhost:80 and all the sockets work fine.

Thank you.