cannot get authorization code after launch

[yanandyan]

Hi,

I am copying code from http://docs.smarthealthit.org/tutorials/authorization/

After launch, when the redirect URL is accessed, the "code" is undefined, I do get a valid "state" value, the authorization server did not authorize my access. How do I debug this, what did I miss?

<script>
    // get the URL parameters received from the authorization server
    var state = getUrlParameter("state");  // session key, this is valid
    var code = getUrlParameter("code");    // authorization code,   It is Undefined.
    console.log("state " +  state + ", code " + code);

Thx!