title: Cancel http request
body: <p>In jQuery ajax there's a way to abort ajax queries:</p>
  
  <pre><code>var xhr = $.ajax({ ... });
  </code></pre>
  
  <p>when user wants to abort the operation or navigates to other page in a single page app I can call</p>
  
  <pre><code>xhr.abort();
  </code></pre>
  
  <p>In angular2-http api I cannot find any possibility to abort the query as it uses rxjs.</p>
  
  <p>Is there a way to abort the ajax query in angular2?</p>