code: public EpollSocketChannelConfig setTcpFastOpenConnect(boolean fastOpenConnect) {
          try {
              ((EpollSocketChannel) channel).socket.setTcpFastOpenConnect(fastOpenConnect);
              return this;
          } catch (IOException e) {
              throw new ChannelException(e);
          }
      }
docs: Set the {@code TCP_FASTOPEN_CONNECT} option on the socket. Requires Linux kernel 4.11 or later.
  See
  <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19f6d3f3">this commit</a>
  for more details.