title: questions about tcp half-close
body: <p>please see the following pic:</p>
  
  <p><img src="https://i.stack.imgur.com/fBJw1.gif" alt="enter image description here"></p>
  
  <p>the client initiate a half-close request and get acknowledged,if i dont misunderstand what half-close means,the client <em>should not be able to send</em> any data afterwards, then how can it send back an <strong>ACK</strong> later.</p>