- applying some of the changes proposed by Joern Huxhorn in his patch dated 2008-01-26 (bug 109)

The defensive code compensating for the bug in 0.9.8 until 0.9.9 is released was not merged because it is a workaround hiding the true logic of the code.
 
  void buildResponseHeaderMap() {
    if (responseHeaderMap == null) {
      if(serverAdapter != null) {     <-- ---- not merged
        responseHeaderMap = serverAdapter.buildResponseHeaderMap();
      } else {
        responseHeaderMap = new HashMap<String, String>();
      }
     }
   }