title: reuse the Jsoup connection
body: <p>i like Jsoup for parsing html, but has problem with their connection, i need to send request to the same website but different query parameter, say "id=XXX", the request is like this:</p>
  
  <pre><code>http://website/?id=XXX
  </code></pre>
  
  <p>i dont want to create a new connection for each id, instead i keep one connection for all the id request, here is my code:</p>
  
  <pre><code>Connection conn = null;
  
  ..
  if (_conn == null) {
   _conn = Jsoup.connect("http://website/";
  }
  doc = _conn.data("id", id).get()
  ..
  </code></pre>
  
  <p>but it seems it only works for the first time, and then just repeat the same request everytime my code run, in that case i can only query the first id even though i pass different id for other time. how can i solve this?</p>