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2026-01-02 04:23:40 +08:00 · 2025-12-31 16:00:29 +00:00
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+  <!--[if IE]><marquee style="top: -15px; position: relative;"><small>发现当前浏览器为Internet Explorer，这不影响你的浏览，但可能会有一些功能无法使用……</small></marquee><![endif]-->
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+
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+        
+        <li style="width: 270px; border-right: none;"><a href="/MayxBlog.tgz">Download <strong>TGZ File</strong></a></li>
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+    <section class="h-entry">
+
+      <small><time class="date dt-published" datetime="2025-08-01T00:00:00+08:00">1 August 2025</time> - 字数统计：4085 - 阅读大约需要14分钟 - Hits: <span id="/2025/08/01/sw-proxy.html" class="visitors">Loading...</span></small>
+<h1 class="p-name">用Service Worker实现一个反向代理</h1>
+
+<p class="view">by <a class="p-author h-card" href="//github.com/Mabbs">mayx</a></p>
+<div id="outdate" style="display:none;">
+  <hr /><p>
+  这是一篇创建于 <span id="outime"></span> 天前的文章，其中的信息可能已经有所发展或是发生改变。
+  </p>
+</div>
+<script>
+  daysold = Math.floor((new Date().getTime() - new Date("Fri, 01 Aug 2025 00:00:00 +0800").getTime()) / (24 * 60 * 60 * 1000));
+  if (daysold > 90) {
+    document.getElementById("outdate").style.display = "block";
+    document.getElementById("outime").innerHTML = daysold;
+  }
+</script>
+
+<hr />
+
+<b>AI摘要</b>
+<p id="ai-output">这篇文章介绍了作者如何利用Service Worker在现代浏览器中实现一个简单的反向代理功能，以提供博客的备份和离线访问。作者原本希望通过Service Worker在用户浏览器中运行一个Web服务器来存储博客副本，但发现 tar.gz 文件的处理需要第三方库且难以找到适用的解决方案，尤其是对于tar文件的处理。作者最终选择使用Service Worker作为反向代理，将请求转发到其他网站，如GeoCities风格的静态网站托管平台，实现了类似的效果。这个过程中，作者体验到了浏览器功能的强大，并认为Service Worker在离线场景中有更大的潜力，尽管在他的例子中并没有充分展示这种优势。</p>
+
+<hr />
+
+
+
+<ul><li><a href="#起因">起因</a></li><li><a href="#研究实现方案">研究实现方案</a></li><li><a href="#使用service-worker进行反向代理">使用Service Worker进行反向代理</a></li><li><a href="#感想">感想</a></li></ul>
+<hr />
+
+
+ <main class="post-content e-content" role="main"><p>现代浏览器真是强大，可以替代一些服务器的功能了！<!--more--></p>
+<h1 id="起因">
+  
+  
+    <a href="#起因"><svg class='octicon' viewBox='0 0 16 16' version='1.1' width='16' height='32' aria-hidden='true'><path fill-rule='evenodd' d='M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z'></path></svg></a> 起因
+  
+  
+</h1>
+    
+<p>前段时间在和群友聊天的时候，提到了我博客的<a href="/2022/02/14/move.html">分发方案</a>，这么多年过去之后我已经在很多平台上<a href="/proxylist.html">分发</a>了我的博客，不过这只是多重冗余，并不算去中心化（虽然我也有向IPFS同步，不过IPFS还得pin，也不太可靠）……所以这么看来，我的博客似乎还不算极其可靠😂？但其实不完全是这样。因为除了向不同平台的分发，我的博客还有一个全文搜索的功能。更重要的是，之前做<a href="/2024/10/01/suggest.html">文章推荐功能</a>时，会把整个博客所有文章的文字存到访客浏览器的localStorage中。这么说来，只要有人访问了我博客的文章，他们的浏览器中就会保存一份我博客文章的完整文本副本。从这个角度看，可靠性应该算是相当高了吧？ </p><p>
+  不过我之前的分发方案里还记录了一点，在GitHub Pages以外的平台我还打包了一份全站生成后的代码，之所以要全站打包，也是希望我的博客能尽可能的分发，考虑到几乎所有的Linux发行版一定有tar，而不一定有zip，所以我最终打包成了tgz格式。如果能让访客下载这个全站打包好的副本，相比于浏览器里只存储了文章文字的全文数据，这应该是一个更好的备份方式吧？毕竟我的博客本身也是我的作品……所以这个压缩包到底有什么地方可以用到呢？ </p><p>
+  这时候我想起来，现代的浏览器功能已经非常强大了，甚至在浏览器里直接运行一个Web服务器也完全没问题。如果能让访客在浏览器里下载那个压缩包并运行一个Web服务器，那就相当于在他们本地设备上部署了一份我的博客副本。这样一来，除了我自己搭建的网站之外，这些访客的本地也运行着一个我的博客实例😆（当然，这份副本只有访客自己能看到）。</p>
+<h1 id="研究实现方案">
+  
+  
+    <a href="#研究实现方案"><svg class='octicon' viewBox='0 0 16 16' version='1.1' width='16' height='32' aria-hidden='true'><path fill-rule='evenodd' d='M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z'></path></svg></a> 研究实现方案
+  
+  
+</h1>
+    
+<p>想要在浏览器上运行Web服务器其实很简单，那就是使用Service Worker，它可以完全离线在浏览器上工作。格式的话和以前写过的Cloudflare Worker非常相似，毕竟Cloudflare Worker就是模仿Service Worker的方式运行啊😂，所以我要是想写Service Worker应该很简单。 </p><p>
+  有了执行的东西之后就是存储，在Service Worker上存储可以用Cache Storage，用它的话不仅可以保存文件的内容，还可以保存响应头之类的东西，用来和Service Worker配合使用非常的方便，不过既然是Cache，它的可靠性就不能保证了，浏览器很可能在需要的时候清除缓存内容，所以相比之下用IndexedDB应该会更可靠一些。 </p><p>
+  那么接下来就该处理我的tgz文件了，tgz的本质是tar文件被gzip压缩之后的东西。浏览器解压gzip倒是简单，可以用Compression Stream API，但它也只能处理gzip了……对于tar的处理似乎就必须用第三方库。而tar的库在网上搜了搜似乎很少，网上找了个<a href="https://github.com/gera2ld/tarjs">tarjs</a>库，文档写的也看不懂，⭐️也很少，看来是有这个需求的人很少啊，而且还要用现代JS那种开发方式，要用什么npm之类的。在<a href="/2025/07/24/screenshot.html">上一篇文章</a>我就说过我不是专门写前端的，对在自己电脑上安装Node.js之类的东西很反感。后来问AI也完全写不出能用的代码，估计这个功能还是太小众了……另外又想到除了这个问题之外还要处理网站更新的时候该怎么通知Service Worker之类乱七八糟的事情……所以只好作罢😅。</p>
+<h1 id="使用service-worker进行反向代理">
+  
+  
+    <a href="#使用service-worker进行反向代理"><svg class='octicon' viewBox='0 0 16 16' version='1.1' width='16' height='32' aria-hidden='true'><path fill-rule='evenodd' d='M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z'></path></svg></a> 使用Service Worker进行反向代理
+  
+  
+</h1>
+    
+<p>这么看来离线运行我的博客似乎有点麻烦，不过既然都研究了一下Service Worker，不如想想其他能做的事情……比如当作反向代理？虽然在浏览器上搞反向代理好像意义不是很大……但值得一试。我之前见过一个项目叫做<a href="https://github.com/EtherDream/jsproxy">jsproxy</a>，它是用Service Worker实现的正向代理，这给了我一些启发。我在之前研究分发方案的时候发现了一些模仿GeoCities的复古静态网站托管平台，比如<a href="https://neocities.org">Neocities</a>和<a href="https://nekoweb.org">Nekoweb</a>。它们需要通过网页或API才能上传网站，不太方便使用CI/CD的方式部署。但是我又觉得它们的社区很有意思，所以想用Service Worker的方式反代到我的网站，显得我的网站是部署在它们上面一样。 </p><p>
+  这个做起来非常简单，其实就和我以前用<a href="/2021/03/02/workers.html#%E9%A6%96%E5%85%88%E7%BB%99%E8%87%AA%E5%B7%B1%E6%90%AD%E4%B8%AA%E5%8F%8D%E4%BB%A3">Cloudflare Worker搭建反代</a>几乎完全一样，遇到请求之后直接通过Fetch获取内容然后再返回就行，唯一不同的就是浏览器存在跨域策略，在跨域时只有对应网站存在合适的响应头才可以成功请求，还好我用的Pages服务大多都允许跨域。但是在我实际测试的时候发现这个允许跨域的等级不太一样，比如GitHub Pages的响应头里包含<code class="language-plaintext highlighter-rouge">Access-Control-Allow-Origin: *</code>，但是不允许OPTIONS方式请求，另外如果要修改请求头，在响应头里还要一一允许相应的请求头才行……当然对于这种问题解决起来很简单，就和我之前写的<a href="/2025/04/08/feed.html">订阅源预览</a>一样，用<a href="https://github.com/Zibri/cloudflare-cors-anywhere">cloudflare-cors-anywhere</a>搭建的CORS代理就可以，有了这个就可以轻松使用Service Worker反代其他网站了。 </p><p>
+  当然对我来说其实有<code class="language-plaintext highlighter-rouge">Access-Control-Allow-Origin: *</code>就够了，我也不需要花里胡哨的请求方式，也不需要在请求头和请求体里加什么莫名其妙的东西，所以对我来说直接请求我的某一个镜像站就可以，于是代码如下： </p><p>
+  <strong>index.html</strong></p>
+<div class="language-html highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">&lt;!DOCTYPE html&gt;</span>
+<span class="nt">&lt;html&gt;</span>
+
+<span class="nt">&lt;head&gt;</span>
+    <span class="nt">&lt;meta</span> <span class="na">charset=</span><span class="s">"UTF-8"</span> <span class="nt">/&gt;</span>
+    <span class="nt">&lt;title&gt;</span>Mayx的博客<span class="nt">&lt;/title&gt;</span>
+<span class="nt">&lt;/head&gt;</span>
+
+<span class="nt">&lt;body&gt;</span>
+    <span class="nt">&lt;script&gt;</span>
+        <span class="c1">// 注册 Service Worker</span>
+        <span class="k">if</span> <span class="p">(</span><span class="dl">'</span><span class="s1">serviceWorker</span><span class="dl">'</span> <span class="k">in</span> <span class="nb">navigator</span><span class="p">)</span> <span class="p">{</span>
+            <span class="nb">navigator</span><span class="p">.</span><span class="nx">serviceWorker</span><span class="p">.</span><span class="nx">register</span><span class="p">(</span><span class="dl">'</span><span class="s1">/sw.js</span><span class="dl">'</span><span class="p">)</span>
+                <span class="p">.</span><span class="nx">then</span><span class="p">(</span><span class="nx">registration</span> <span class="o">=&gt;</span> <span class="p">{</span>
+                    <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="dl">'</span><span class="s1">Service Worker 注册成功:</span><span class="dl">'</span><span class="p">,</span> <span class="nx">registration</span><span class="p">.</span><span class="nx">scope</span><span class="p">);</span>
+                    <span class="c1">// 刷新网页</span>
+                    <span class="nx">location</span><span class="p">.</span><span class="nx">reload</span><span class="p">();</span>
+                <span class="p">})</span>
+                <span class="p">.</span><span class="k">catch</span><span class="p">(</span><span class="nx">error</span> <span class="o">=&gt;</span> <span class="p">{</span>
+                    <span class="nx">console</span><span class="p">.</span><span class="nx">error</span><span class="p">(</span><span class="dl">'</span><span class="s1">Service Worker 注册失败:</span><span class="dl">'</span><span class="p">,</span> <span class="nx">error</span><span class="p">);</span>
+                    <span class="nx">location</span><span class="o">=</span><span class="dl">"</span><span class="s2">https://mabbs.github.io</span><span class="dl">"</span><span class="p">;</span>
+                <span class="p">});</span>
+        <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
+            <span class="nx">location</span><span class="o">=</span><span class="dl">"</span><span class="s2">https://mabbs.github.io</span><span class="dl">"</span><span class="p">;</span>
+        <span class="p">}</span>
+    <span class="nt">&lt;/script&gt;</span>
+    <span class="nt">&lt;h1&gt;</span>Redirecting<span class="ni">&amp;hellip;</span><span class="nt">&lt;/h1&gt;</span>
+    <span class="nt">&lt;a</span> <span class="na">href=</span><span class="s">"https://mabbs.github.io"</span><span class="nt">&gt;</span>Click here if you are not redirected.<span class="nt">&lt;/a&gt;</span>
+<span class="nt">&lt;/body&gt;</span>
+
+<span class="nt">&lt;/html&gt;</span>
+</code></pre></div></div>
+<p><strong>sw.js</strong></p>
+<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">const</span> <span class="nx">TARGET_SITE</span> <span class="o">=</span> <span class="dl">'</span><span class="s1">被反代的网站</span><span class="dl">'</span><span class="p">;</span> <span class="c1">//也可以用CORS代理</span>
+
+<span class="nb">self</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">(</span><span class="dl">'</span><span class="s1">install</span><span class="dl">'</span><span class="p">,</span> <span class="nx">event</span> <span class="o">=&gt;</span> <span class="p">{</span>
+    <span class="c1">// 强制立即激活新 Service Worker</span>
+    <span class="nx">event</span><span class="p">.</span><span class="nx">waitUntil</span><span class="p">(</span><span class="nb">self</span><span class="p">.</span><span class="nx">skipWaiting</span><span class="p">());</span>
+<span class="p">});</span>
+
+<span class="nb">self</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">(</span><span class="dl">'</span><span class="s1">activate</span><span class="dl">'</span><span class="p">,</span> <span class="nx">event</span> <span class="o">=&gt;</span> <span class="p">{</span>
+    <span class="c1">// 立即控制所有客户端</span>
+    <span class="nx">event</span><span class="p">.</span><span class="nx">waitUntil</span><span class="p">(</span><span class="nb">self</span><span class="p">.</span><span class="nx">clients</span><span class="p">.</span><span class="nx">claim</span><span class="p">());</span>
+<span class="p">});</span>
+
+<span class="nb">self</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">(</span><span class="dl">'</span><span class="s1">fetch</span><span class="dl">'</span><span class="p">,</span> <span class="nx">event</span> <span class="o">=&gt;</span> <span class="p">{</span>
+    <span class="k">if</span> <span class="p">(</span><span class="k">new</span> <span class="nx">URL</span><span class="p">(</span><span class="nx">event</span><span class="p">.</span><span class="nx">request</span><span class="p">.</span><span class="nx">url</span><span class="p">).</span><span class="nx">origin</span> <span class="o">==</span> <span class="nb">self</span><span class="p">.</span><span class="nx">location</span><span class="p">.</span><span class="nx">origin</span><span class="p">)</span> <span class="p">{</span>
+        <span class="nx">event</span><span class="p">.</span><span class="nx">respondWith</span><span class="p">(</span><span class="nx">handleProxyRequest</span><span class="p">(</span><span class="nx">event</span><span class="p">.</span><span class="nx">request</span><span class="p">));</span>
+    <span class="p">}</span>
+<span class="p">});</span>
+
+<span class="k">async</span> <span class="kd">function</span> <span class="nx">handleProxyRequest</span><span class="p">(</span><span class="nx">request</span><span class="p">)</span> <span class="p">{</span>
+    <span class="k">try</span> <span class="p">{</span>
+        <span class="c1">// 构建目标 URL</span>
+        <span class="kd">const</span> <span class="nx">targetUrl</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">URL</span><span class="p">(</span><span class="nx">request</span><span class="p">.</span><span class="nx">url</span><span class="p">);</span>
+        <span class="kd">const</span> <span class="nx">proxyUrl</span> <span class="o">=</span> <span class="nx">TARGET_SITE</span> <span class="o">+</span> <span class="nx">targetUrl</span><span class="p">.</span><span class="nx">pathname</span> <span class="o">+</span> <span class="nx">targetUrl</span><span class="p">.</span><span class="nx">search</span><span class="p">;</span>
+
+        <span class="c1">// 创建新请求（复制原请求属性）</span>
+        <span class="kd">const</span> <span class="nx">proxyRequest</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Request</span><span class="p">(</span><span class="nx">proxyUrl</span><span class="p">,</span> <span class="p">{</span>
+            <span class="na">method</span><span class="p">:</span> <span class="nx">request</span><span class="p">.</span><span class="nx">method</span><span class="p">,</span>
+            <span class="c1">// headers: request.headers,</span>
+            <span class="c1">// body: request.body</span>
+        <span class="p">});</span>
+
+        <span class="c1">// 发送代理请求</span>
+        <span class="kd">const</span> <span class="nx">response</span> <span class="o">=</span> <span class="k">await</span> <span class="nx">fetch</span><span class="p">(</span><span class="nx">proxyRequest</span><span class="p">);</span>
+
+        <span class="c1">// 返回修改后的响应</span>
+        <span class="k">return</span> <span class="k">new</span> <span class="nx">Response</span><span class="p">(</span><span class="nx">response</span><span class="p">.</span><span class="nx">body</span><span class="p">,</span> <span class="p">{</span>
+            <span class="na">status</span><span class="p">:</span> <span class="nx">response</span><span class="p">.</span><span class="nx">status</span><span class="p">,</span>
+            <span class="na">statusText</span><span class="p">:</span> <span class="nx">response</span><span class="p">.</span><span class="nx">statusText</span><span class="p">,</span>
+            <span class="na">headers</span><span class="p">:</span> <span class="nx">response</span><span class="p">.</span><span class="nx">headers</span>
+        <span class="p">});</span>
+
+    <span class="p">}</span> <span class="k">catch</span> <span class="p">(</span><span class="nx">error</span><span class="p">)</span> <span class="p">{</span>
+        <span class="nx">console</span><span class="p">.</span><span class="nx">error</span><span class="p">(</span><span class="dl">'</span><span class="s1">Proxy error:</span><span class="dl">'</span><span class="p">,</span> <span class="nx">error</span><span class="p">);</span>
+        <span class="k">return</span> <span class="k">new</span> <span class="nx">Response</span><span class="p">(</span><span class="dl">'</span><span class="s1">Proxy failed</span><span class="dl">'</span><span class="p">,</span> <span class="p">{</span> <span class="na">status</span><span class="p">:</span> <span class="mi">500</span> <span class="p">});</span>
+    <span class="p">}</span>
+<span class="p">}</span>
+</code></pre></div></div>
+<p>最终的实际效果： <a href="https://mayx.nekoweb.org">https://mayx.nekoweb.org</a></p>
+<h1 id="感想">
+  
+  
+    <a href="#感想"><svg class='octicon' viewBox='0 0 16 16' version='1.1' width='16' height='32' aria-hidden='true'><path fill-rule='evenodd' d='M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z'></path></svg></a> 感想
+  
+  
+</h1>
+    
+<p>虽然折腾了半天没能增强我博客的可靠性……但是体会到了现代浏览器的强大之处，难怪前几年会提出ChromeOS和PWA之类的东西，原来浏览器功能还是相当强大的，用了Service Worker以后即使是纯前端也可以有和使用服务器一样的体验，在过去的浏览器中要是想实现这样的功能……好像也不是不可能😂，用AJAX加服务器使用伪静态策略其实是可以做到的……其实Service Worker的功能更多还是在离线时使用的，我这个例子好像没体现它的优势😆。 </p><p>
+  但总的来说相比以前想要实现这种反代的功能代码还是更清晰，也更简单了，也许以后如果有机会我又有心思让博客在访客浏览器上离线运行，那就可以体现Service Worker真正的优势了🤣。</p></main> 
+
+
+<small style="display: block">tags: <a rel="category tag" class="p-category" href="/search.html?keyword=%E6%B5%8F%E8%A7%88%E5%99%A8"><em>浏览器</em></a> - <a rel="category tag" class="p-category" href="/search.html?keyword=Service%20Worker"><em>Service Worker</em></a> - <a rel="category tag" class="p-category" href="/search.html?keyword=Worker"><em>Worker</em></a> - <a rel="category tag" class="p-category" href="/search.html?keyword=%E5%8F%8D%E5%90%91%E4%BB%A3%E7%90%86"><em>反向代理</em></a> <span style="float: right;"><a href="https://gitlab.com/mayx/mayx.gitlab.io/tree/master/_posts/2025-08-01-sw-proxy.md">查看原始文件</a></span></small>
+
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