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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<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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