title: Remove default headers with Restangular
body: <p>I'm wondering why everybody asking about 'setting default headers' in Restangular for authorization, but there's no info how to clear this header if user do 'log out'.</p>
  
  <p>I do:</p>
  
  <pre><code>Restangular.setDefaultHeaders({Authorization: accessToken}); 
  </code></pre>
  
  <p>How to manually remove this header?</p>