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Bugs and Workarounds

There are some known bugs in socket.io (valid for socket.io-client 0.8.6). I consider them "show-stoppers", but you can work around them with some degree of luck.

Connect after disconnect

Unfortunately, disconnection is bugged in socket.io client. If you close socket connection, io.connect() to the same endpoint will silently fail. If you try to forcibly connect associated socket, it will work, but you have to make sure that you're not setting up callbacks again, as you will end up having your callbacks called twice.

Link: https://github.com/LearnBoost/socket.io-client/issues/251

For now, if your main connection was closed, you have few options:

var conn = io.connect(addr, {'force new connection': true});
conn.on('message', function(msg) { alert('msg') });

or alternative approach:

io.j = [];
io.sockets = [];

var conn = io.connect(addr);
conn.on('message', function(msg) { alert('msg') });

or separate reconnection from initial connection:

var conn = io.connect(addr);
conn.on('disconnect', function(msg) { conn.socket.reconnect(); });

If you use first approach, you will lose multiplexing for good.

If you use second approach, apart of it being quite hackish, it will clean up existing sockets, so socket.io will have to create new one and will use it to connect to endpoints. Also, instead of clearing io.sockets, you can remove socket which matches your URL.

If you use third approach, make sure you're not setting up events again.

On a side note, if you can avoid using disconnect() for socket, do so.

Query string parameters

Current implementation of socket.io client stores query string parameters on session level. So, if you have multiplexed connections and want to pass parameters to them - it is not possible.

See related bug report: https://github.com/LearnBoost/socket.io-client/issues/331

So, you can not expect query string parametes to be passed to your virtual connections and will have to structure your JS code, so first io.connect() will include anything you want to pass to the server.

Windows and anti-virus software

It is known that some anti-virus software (I'm lookin at you, Avast) is messing up with websockets protocol if it is going through the port 80. Avast proxies all traffic through local proxy which does some on-the-fly traffic analysis and their proxy does not support websockets - all messages sent from server are queued in their proxy, connection is kept alive, etc.

Unfortunately, socket.io does not support this situation and won't fallback to other protocol.

There are few workarounds: 1. Disable websockets for everyone (duh) 2. Run TornadIO2 (or your proxy/load balancer) on two different ports and have simple logic

on client side to switch to another port if connection fails

Socket.IO developers are aware of the problem and next socket.io version will provide official workaround.

Here's more detailed article on the matter: https://github.com/LearnBoost/socket.io/wiki/Socket.IO-and-firewall-software.

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