code: public <T> ClientFactoryBuilder channelOption(ChannelOption<T> option, T value) {
          requireNonNull(option, "option");
          checkArgument(!PROHIBITED_SOCKET_OPTIONS.contains(option),
                        "prohibited socket option: %s", option);
  
          channelOptions.put(option, requireNonNull(value, "value"));
          return this;
      }
docs: Sets the options of sockets created by the {@link ClientFactory}.