title: socket.io handshake return error "Transport unknown"
body: <p>I'm trying to use <a href="https://github.com/Wisembly/elephant.io" rel="noreferrer">elephant.io</a> to send event from my PHP script to my nodejs server.
  Performing tests with this library I've noticed that the handshake was not happening as expected.</p>
  
  <p>After <a href="https://github.com/LearnBoost/socket.io-spec#handshake" rel="noreferrer">reading the specs about client-server handshake</a> with socket.io, I've tested a simple handshake request to my nodejs server:</p>
  
  <pre><code>POST "http://acme.local:3700/socket.io/1"
  </code></pre>
  
  <p>But this is returning the following JSON message:</p>
  
  <pre><code>{
      "code": 0,
      "message": "Transport unknown"
  }
  </code></pre>
  
  <p>I'm not sure if this error is due to the version of socket.io I'm using (v1.0.2) or if the handshake request is simply malformed.</p>