code: public void add(AsciiString name, String value){
          if(name==null || value==null)
              return;
          Header head = entry(name, true);
          if(head.value==null)
              head.value = value;
          else{
              Header newHeader = newHeader(name);
              newHeader.value = value;
              Header tail = head.samePrev;
              tail.sameNext = newHeader;
              newHeader.samePrev = tail;
              head.samePrev = newHeader;
          }
          assert validateLinks();
      }
docs: /*-------------------------------------------------[ Add ]---------------------------------------------------