title: X-FACEBOOK-PLATFORM for Facebook Chat - can't connect since Oct 1st
body: <p>With the OAuth 2.0 and encrypted access token changes I can't connect to FB chat anymore.  The example on FB's chat document shows PHP on the server side, however I need to connect by getting the access_token from the JavaScript sdk.  </p>
  
  <p>I took out the sig and session_key parameters from my challenge response, and added the parameter for access_token, setting it to the access_token I get from the JavaScript sdk.  I assume the access_token is correct because before Oct 1st it had pipes in it, and now it's encrypted without the pipe symbols.  Also looking at my security settings, the xmpp_login permission is being set properly when I initially grant permissions.</p>
  
  <p>No matter what I try my connection attempt fails.</p>
  
  <p>Does anyone have working code where the access token comes from the JavaScript sdk in a browser rather than from the server side?</p>