https://5py.top/tags/fallback/Recent content in Fallback on 吾便宜Hugo -- gohugo.iozh-CN© 2026 吾便宜Thu, 18 Jun 2026 19:18:00 +0800https://5py.top/posts/fallback-explained/Thu, 18 Jun 2026 19:18:00 +0800https://5py.top/posts/fallback-explained/<figure class="article-illustration"> <img src="https://img.5py.top/img/vpn-guide.svg" alt="Fallback 回落机制原理" loading="lazy" decoding="async"> </figure> <p><em>插图来源：<a href="https://storyset.com/" target="_blank" rel="noreferrer">Storyset</a></em></p> <h2 class="relative group">问：什么是 fallback（回落）？ <div id="问什么是-fallback回落" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e9%97%ae%e4%bb%80%e4%b9%88%e6%98%af-fallback%e5%9b%9e%e8%90%bd" aria-label="锚点">#</a> </span> </h2> <p>答：服务端只开一个端口（通常是 443），却能同时服务多种流量：Trojan 用户连进来走代理，普通访客连进来看到的是一个正常网站。服务端像个门卫，看一眼来人的&quot;暗号&quot;，决定把他领去哪。</p>