title: http.get to a url that includes a dynamic value
body: <p>I want to do a $http.get request from my controller to the url /users/1 where 1 is a dynamic value decided by input from the user.</p>
  
  <p>1 is currently bound to $scope.userid but </p>
  
  <pre><code>$http.get('/users', $scope.userid);
  </code></pre>
  
  <p>sends the request to /users not users/1</p>