code: public void nextProtocols(String ...protocols)
    {
      if (protocols == null || protocols.length == 0) {
        _nextProtocols = null;
        return;
      }
      
      StringBuilder sb = new StringBuilder();
      for (String protocol : protocols) {
        if (protocol == null || "".equals(protocol)) {
          continue;
        }
        
        sb.append((char) protocol.length());
        sb.append(protocol);
      }
      
      _nextProtocols = sb.toString();
    }
docs: Sets the next protocols.