WebSocket handshake with Ruby and EM::WebSocket::Server

I am trying to create a simple WebSocket connection in JavaScript against my Rails app. I get the following:

WebSocket connection to 'ws://localhost:4000/' failed: Error during WebSocket handshake: 'Sec-WebSocket-Accept' header is missing

What am I doing wrong? Here is my code:

JavaScript:

var socket = new WebSocket('ws://localhost:4000');

socket.onopen = function() {
  var handshake =
    "GET / HTTP/1.1\n" +
    "Host: localhost\n" +
    "Upgrade: websocket\n" +
    "Connection: Upgrade\n" +
    "Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==\n" +
    "Sec-WebSocket-Protocol: quote\n" +
    "Sec-WebSocket-Version: 13\n" +
    "Origin: http://localhost\n";

  socket.send(handshake);
};

socket.onmessage = function(data) {
  console.log(data);
};

Ruby:

require 'rubygems'
require 'em-websocket-server'

module QuoteService
  class WebSocket < EventMachine::WebSocket::Server
    def on_connect
      handshake_response =  "HTTP/1.1 101 Switching Protocols\n"
      handshake_response << "Upgrade: websocket\n"
      handshake_response << "Connection: Upgrade\n"
      handshake_response << "Sec-WebSocket-Accept: HSmrc0sMlYUkAGmm5OPpG2HaGWk=\n"
      handshake_response << "Sec-WebSocket-Protocol: quote\n"

      send_message(handshake_response)
    end

    def on_receive(data)
      puts 'RECEIVED: ' + data
    end
  end
end

EventMachine.run do
  print 'Starting WebSocket server...'
  EventMachine.start_server '0.0.0.0', 4000, QuoteService::WebSocket
  puts 'running'
end

The handshake headers are per Wikipedia.

Copyright Notice：Content Author:「Chad Johnson」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/17374453/websocket-handshake-with-ruby-and-emwebsocketserver