title: Why should there be only one instance of HTTPClient?
body: <p>Read tutorials on using httpClient(HttpClient API by Apache), it said that we should have only one instance of HttpClient. So Below are my doubts..</p>
  
  <ol>
  <li>Why is it so?</li>
  <li>Can I have two HttpClient on different threads.?</li>
  </ol>