制发送端的图示：</p>
<p><img decoding="async" loading="lazy" class="aligncenter size-full wp-image-11617" src="/uploads/2014/05/tcpswflow.png" alt="" width="666" height="836" srcset="" sizes="(max-width: 666px) 100vw, 666px"/></p>
<p style="text-align: center;">（<a href="http://www.tcpipguide.com/free/t_TCPWindowSizeAdjustmentandFlowControl-2.htm" target="_blank">图片来源</a>）</p>
<h5 style="text-align: left;"><span class="ez-toc-section" id="Zero_Window"></span>Zero Window<span class="ez-to