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<small><time class="date dt-published" datetime="2021-01-06T00:00:00+08:00">6 January 2021</time> - 字数统计：1509 - 阅读大约需要5分钟 - Hits: <span id="/2021/01/06/proxy.html" class="visitors">Loading...</span></small>
<h1 class="p-name">如何用PHP制作一个简单的反向代理</h1>
<p class="view">by <a class="p-author h-card" href="//github.com/Mabbs">mayx</a></p>
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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。
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<b>AI摘要</b>
<p id="ai-output">这篇文章讲述了作者在被国内运营商屏蔽Github Pages后，如何用PHP制作一个简单的反向代理以解决博客访问问题的经历。作者先尝试使用PHP的file_get_contents来实现反代，但遇到了CSS和JS MIME类型问题。通过研究Header，作者重写了请求的Header信息，最终实现通过PHP脚本重定向到目标URL，并解决了MIME类型的匹配问题。文章最后，作者成功地将博客域名更换并调整了Gitalk的返回地址，让博客在中国用户中正常工作，同时表达了对网络环境改善的希望。</p>
<hr />
<ul><li><a href="#起因">起因</a></li><li><a href="#解决过程">解决过程</a></li><li><a href="#之后的操作">之后的操作</a></li></ul>
<hr />
<main class="post-content e-content" role="main"><p>解决问题还是很简单的。<!--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>由于莫名其妙的原因，很多运营商都屏蔽了Github Pages，导致我上我的博客很困难。这令我很不高兴，但是没办法，毕竟在中国就是这样，搭个网站很麻烦。 </p><p>
在两年前，我的博客也被屏蔽过一次，那时候我是用的Nginx反代解决这个问题的，不过Nginx反代要服务器，当时我用的是花火学园的服务器来搞，但是现在因为登一次花火学园的服务器很麻烦，网络卡的不得了，所以没办法，我只好想想别的更简单的方法解决这个问题。 </p><p>
这时候我就想到了PHP，用PHP解决这个问题应该很简单，用<code class="language-plaintext highlighter-rouge">file_get_contents()</code>应该很轻松就可以解决这个问题。</p>
<h1 id="解决过程">
<a href="#解决过程"><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> 解决过程
</h1>
<p>理论上来说，只要整一个php然后里面直接用<code class="language-plaintext highlighter-rouge">echo file_get_contents(url)</code>就可以实现反代了，所以首先就按这个思路做，为了让访问的所有请求都发送到这个php里，我得用重写的方式。 </p><p>
我用的是GearHost的虚拟主机，他们的主机都用的是IIS，这导致我还得了解一下IIS的重写怎么搞，还好我的方案和WordPress的重写方案很像，我就直接按照WordPress的方式写了。 </p><p>
把下面的代码放到Rewrite的rules段里就可以正常工作了：</p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">name=</span><span class="s">"Mayx"</span> <span class="na">stopProcessing=</span><span class="s">"true"</span><span class="nt">&gt;</span>
<span class="nt">&lt;match</span> <span class="na">url=</span><span class="s">"^(.*)$"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;conditions&gt;</span>
<span class="nt">&lt;add</span> <span class="na">input=</span><span class="s">"{REQUEST_FILENAME}"</span> <span class="na">matchType=</span><span class="s">"IsFile"</span> <span class="na">negate=</span><span class="s">"true"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;add</span> <span class="na">input=</span><span class="s">"{REQUEST_FILENAME}"</span> <span class="na">matchType=</span><span class="s">"IsDirectory"</span> <span class="na">negate=</span><span class="s">"true"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/conditions&gt;</span>
<span class="nt">&lt;action</span> <span class="na">type=</span><span class="s">"Rewrite"</span> <span class="na">url=</span><span class="s">"index.php"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/rule&gt;</span>
</code></pre></div></div>
<p>然后就是新建一个index.php文件，路径的话用<code class="language-plaintext highlighter-rouge">$_SERVER['REQUEST_URI']</code>就可以了。 </p><p>
不过如果直接用<code class="language-plaintext highlighter-rouge">echo file_get_contents(url)</code>的方法搞会出现一些问题，比如css和js的MIME类型要求必须和实际一样，但是我这个方案会导致所有请求都是<code class="language-plaintext highlighter-rouge">text/html</code>类型的，这是个很麻烦的问题啊…… </p><p>
后来我花了2个小时查资料，搜php怎么读MIME，结果搜到的全是<code class="language-plaintext highlighter-rouge">mime_content_type()</code>之类乱七八糟的东西，让人很难受。我仔细思考了一下，MIME是在Header里声明的，我应该去搜Header，而不是怎么读MIME，最终可算是搜到了一点有用的东西了，也就是<code class="language-plaintext highlighter-rouge">$http_response_header</code>，这个东西好像是个数组，后来我想了一下干脆不要考虑怎么读MIME，直接把Header跟着重写一遍算了，于是最终代码如下：</p>
<div class="language-php highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">&lt;?php</span>
<span class="nv">$content</span><span class="o">=</span><span class="nb">file_get_contents</span><span class="p">(</span><span class="s2">"https://mabbs.github.io"</span><span class="mf">.</span><span class="nv">$_SERVER</span><span class="p">[</span><span class="s1">'REQUEST_URI'</span><span class="p">]);</span>
<span class="k">foreach</span><span class="p">(</span><span class="nv">$http_response_header</span> <span class="k">as</span> <span class="nv">$header</span><span class="p">){</span>
<span class="nb">header</span><span class="p">(</span><span class="nv">$header</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">if</span><span class="p">(</span><span class="nv">$content</span><span class="p">){</span>
<span class="k">echo</span> <span class="nv">$content</span><span class="p">;</span>
<span class="p">}</span><span class="k">else</span><span class="p">{</span>
<span class="k">echo</span> <span class="s2">"404"</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div></div>
<h1 id="之后的操作">
<a href="#之后的操作"><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> 之后的操作
</h1>
<p>这么搞完之后基本上就可以正常工作了，于是我的博客域名再一次更换（专供中国用户）：<a href="https://yuki.gear.host/">yuki.gear.host</a>，另外把备用的Gitalk的Github Apps返回地址也改了，基本上就可以正常工作了。希望以后GFW能做个人，不要再乱搞国内的网络环境了。</p></main>
<small style="display: block">tags: <a rel="category tag" class="p-category" href="/search.html?keyword=PHP"><em>PHP</em></a> - <a rel="category tag" class="p-category" href="/search.html?keyword=%E4%BB%A3%E7%90%86"><em>代理</em></a> <span style="float: right;"><a href="https://gitlab.com/mayx/mayx.gitlab.io/tree/master/_posts/2021-01-06-proxy.md">查看原始文件</a></span></small>
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