title: Why all methods are deprecated in PoolingClientConnectionManager?
body: <p>In Apache httpclient 4.*, why all the methods are deprecated? 
  If all are deprecated , how can we use this class effectively. </p>
  
  <p>When I do a PoolingClientConnectionManager.getTotalStats()</p>
  
  <p>I see the following output </p>
  
  <p>[leased: 2; pending: 0; available: 0; max: 20], and I never see available being above 0 at any concurrency. </p>
  
  <p>Please advise. </p>