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<main>
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<h1 id="最后的项目构建多线程-web-server"><a class="header" href="#最后的项目构建多线程-web-server">最后的项目：构建多线程 web server</a></h1>
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<!-- https://github.com/rust-lang/book/blob/main/src/ch21-00-final-project-a-web-server.md -->
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<!-- commit 56ec353290429e6547109e88afea4de027b0f1a9 -->
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<p>这是一次漫长的旅途，不过我们已经抵达了本书的结尾。在本章中，我们将一同构建另一个项目，来展示最后几章所学，同时复习更早的章节。</p>
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<p>作为最后的项目，我们将要实现一个返回 “hello” 的 web server，它在浏览器中看起来就如图 21-1 所示：</p>
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<p><img src="img/trpl21-01.png" alt="hello from rust"></p>
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<p><span class="caption">图 21-1: 我们最后将一起分享的项目</span></p>
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<p>如下是构建 web server 的计划：</p>
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<ol>
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<li>学习一些 TCP 与 HTTP 知识</li>
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<li>在套接字（socket）上监听 TCP 请求</li>
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<li>解析少量的 HTTP 请求</li>
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<li>创建一个合适的 HTTP 响应</li>
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<li>通过线程池改善 server 的吞吐量</li>
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</ol>
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<p>在开始之前，我们先提两点说明。首先，这里使用的方法并不是使用 Rust 构建 web server 的最佳方式。<a href="https://crates.io/">crates.io</a> 上有很多可用于生产环境的 crate，它们提供了比我们所要编写的更为完整的 web server 和线程池实现。然而，本章的目的在于学习，而不是走捷径。因为 Rust 是一个系统编程语言，我们能够选择处理什么层次的抽象，并能够选择比其他语言可能或可用的层次更低的层次。</p>
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<p>其次，我们不会在这里使用 async 和 await。构建线程池本身已经是一个相当大的挑战，无需再加入构建异步运行时的复杂度！不过，我们会指出 async 和 await 在本章中会遇到的一些问题上的可能应用。</p>
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<p>因此我们将手动编写一个基础的 HTTP server 和线程池，以便学习将来可能用到的 crate 背后的通用理念和技术。</p>
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