HTTP headers in Websockets client API

Question

Looks like it's easy to add custom HTTP headers to your websocket client with any HTTP header client which supports this, but I can't find how to do it with the JSON API.

Yet, it seems that there should be support these headers in the spec.

Anyone has a clue on how to achieve it?

var ws = new WebSocket("ws://example.com/service");

Specifically, I need to be able to send an HTTP Authorization header.

Answer 1

Totally hacked it like this, thanks to kanaka's answer.

Client:

var ws = new WebSocket(
    'ws://localhost:8080/connect/' + this.state.room.id, 
    store('token') || cookie('token') 
);

Server (using Koa2 in this example, but should be similar wherever):

var url = ctx.websocket.upgradeReq.url; // can use to get url/query params
var authToken = ctx.websocket.upgradeReq.headers['sec-websocket-protocol'];
// Can then decode the auth token and do any session/user stuff...

Answer 2

You cannot add headers but, if you just need to pass values to the server at the moment of the connection, you can specify a query string part on the url:

var ws = new WebSocket("ws://example.com/service?key1=value1&key2=value2");

That URL is valid but - of course - you'll need to modify your server code to parse it.