1-ui-app.js

(function ($) {
  //request user 1 in JSON format
  $.getJSON('http://mysite.com/rest/user/1.json', function(data) {
    console.log(data); //print the JSON response object to the console
  });    
})(jQuery);

2-authenticated-response.json

{
   "uid":"1",
   "name":"admin",
   "mail":"admin@mysite.com",
   "theme":"",
   "signature":"",
   "signature_format":"filtered_html",
   "created":"1354058561",
   "access":"1363899033",
   "login":"1363725854",
   "status":"1",
   "timezone":"America/Chicago",
   "language":"",
   "picture":"0",
   "init":"admin@intranet.local",
   "roles":{
      "2":"authenticated user"
   },
}

3-unauthenticated-response.json

[
  "Access denied for user anonymous"
]