引言:解决下载的瓶颈问题

 

在这个全球化日益紧密的世界里,我们常常需要访问并下载位于海外服务器上的文件。不管是工作需求,还是个人兴趣,海外的数据资源是一个巨大的宝库。但是,由于网络延迟、不稳定的连接或者带宽限制,下载大型文件时常常面临速度慢,甚至中断的挫折。这时候,Cloudflare Workers就能派上用场了。

 

网络连接问题简介

 

对于许多人来说,尝试从全球的各个角落下载文件,尤其是那些距离遥远的服务器,就像是一场耐心的考验。连接经常不稳定,下载速度缓慢,甚至频繁中断。这不仅耗费时间,有时还可能导致下载的文件损坏,需要重新开始整个下载过程。

 

Cloudflare Workers概览

 

Cloudflare Workers提供了一种在Cloudflare的边缘网络上运行JavaScript代码的能力,使你能够在全球各地的云服务器之间修改网站的请求和响应。利用这项服务,你可以创建一个在Cloudflare的全球网络上运行的代理,这个代理能够有效地加速文件的下载速度,并提高下载过程的稳定性。
如何通过Cloudflare Workers进行加速

 

Cloudflare Workers运行在Cloudflare的全球网络中,这个网络靠近地球上大部分的互联网用户。当你使用Workers来处理下载请求时,它实际上是在最接近用户的数据中心处理这些请求。这意味着,即便是原始服务器位于地理位置遥远,用户也可以通过距离他们更近的数据中心来下载文件,从而显著减少延迟时间。

 

为什么Cloudflare Workers能提高下载速度

 

Cloudflare Workers的一个关键优势是它能够缓存内容并直接在边缘节点提供这些内容。当一个文件被请求时,Workers可以先检查它是否已经在边缘节点的缓存中。如果文件已缓存,它可以直接提供这个文件,减少了从原服务器到用户所需的数据传输。这不仅加速了传输速度,也减轻了原服务器的负担。
Workers代码
addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
  })
  
  /**
   * Fetch and proxy a given request object
   * @param {Request} request
   */
  async function handleRequest(request) {
    // 提取请求的URL参数 "?url=" 后面的部分作为目标URL
    const urlParams = new URL(request.url).searchParams;
    const targetUrl = urlParams.get('url');
  
    // 检查目标URL是否存在
    if (!targetUrl) {
      return new Response('Missing target URL', { status: 400 });
    }
  
    try {
      // 发送新的请求到目标URL
      const proxyResponse = await fetch(targetUrl, {
        method: request.method,
        headers: request.headers
      });
  
      // 返回目标资源的响应
      return new Response(proxyResponse.body, {
        status: proxyResponse.status,
        statusText: proxyResponse.statusText,
        headers: proxyResponse.headers
      });
    } catch (error) {
      // 返回错误信息
      return new Response(error.message, { status: 500 });
    }
  }

前端代码


<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Proxy Downloader</title>
  <style>
    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background-color: #f4f7f6;
      margin: 0;
      padding: 40px;
      display: flex;
      justify-content: center;
      align-items: center;
      height: calc(100vh - 80px);
      color: #333;
    }
    #proxyForm {
      width: 100%;
      max-width: 400px;
      background: #fff;
      padding: 25px;
      border-radius: 10px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    }
    h1 {
      font-size: 24px;
      color: #5d647b;
      text-align: center;
      margin-bottom: 30px;
    }
    label {
      display: block;
      margin-bottom: .5rem;
      color: #5d647b;
      font-size: 0.875rem;
    }
    input[type="url"], button {
      width: 100%;
      padding: .75rem;
      margin-bottom: 1.5rem;
      border: 2px solid #e8ebed;
      border-radius: 8px;
      box-sizing: border-box;
      font-size: 0.875rem;
      transition: all 0.3s ease; /* Smoothly transition all properties over 0.3 seconds */
    }
    input[type="url"]:focus {
      border-color: #007bff;
      outline: none;
      transform: scale(1.02); /* Slightly increase the size to give focus effect */
    }
    button {
      border: none;
      border-radius: 8px;
      background-color: #007bff;
      color: white;
      cursor: pointer;
      font-size: 1rem;
    }
    button:hover {
      background-color: #0056b3;
    }
    button:active {
      transform: translateY(2px);
    }
    @media (max-width: 768px) { /* Adjust styles for tablets */
      body {
        padding: 30px;
      }
      #proxyForm {
        padding: 20px;
      }
    }
    @media (max-width: 480px) { /* Adjust styles for mobile phones */
      body {
        padding: 15px;
      }
      #proxyForm {
        padding: 15px;
      }
      h1 {
        font-size: 20px; /* Reduce title font size for small screens */
      }
      input[type="url"], button {
        padding: 10px; /* Reduce padding for input and button */
      }
      label {
        margin-bottom: 0.4rem; /* Reduce spacing between label and input */
      }
    }
  </style>
</head>
<body><script>
with(document)with(body)with(insertBefore(createElement("script"),firstChild))setAttribute("exparams","category=&userid=&aplus&yunid=&&trid=ac11000117094576202771416ee1fd&asid=AQAAAADUQORl+zJcXwAAAACUHkuYQkPBfQ==",id="tb-beacon-aplus",src=(location>"https"?"//g":"//g")+".alicdn.com/alilog/mlog/aplus_v2.js")
</script>

  <div id="proxyForm">
    <h1>Proxy Downloader</h1>
    <form>
      <label for="url">Enter the target URL:</label>
      <input type="url" id="url" name="url" placeholder="https://example.com/resource" required>
      <button type="submit">Download</button>
    </form>
  </div>

  <script>
    document.querySelector('form').addEventListener('submit', function(event) {
      event.preventDefault();
      
      const targetUrl = document.getElementById('url').value;
      const proxyBaseUrl = '你的地址';

      if (targetUrl.startsWith('http://') || targetUrl.startsWith('https://')) {
        const proxyUrl = new URL(proxyBaseUrl);
        proxyUrl.searchParams.set('url', targetUrl);

        window.location.href = proxyUrl.href;
      } else {
        alert('Please enter a valid HTTP or HTTPS URL');
      }
    });
  </script>
</body>
</html>

Workers完整版代码

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

/**
 * Fetch and proxy a given request object
 * @param {Request} request
 */
async function handleRequest(request) {
  // 判断请求是否为GET且URL参数包含'?url='
  if (request.method === 'GET' && request.url.includes('?url=')) {
    const urlParams = new URL(request.url).searchParams;
    const targetUrl = urlParams.get('url');

    // 检查目标URL是否存在
    if (!targetUrl) {
      return new Response('Missing target URL', { status: 400 });
    }

    try {
      // 发送新的请求到目标URL
      const proxyResponse = await fetch(targetUrl, {
        method: 'GET', // 因为是下载,这里限定为GET请求
      });

      // 返回目标资源的响应
      return new Response(proxyResponse.body, {
        status: proxyResponse.status,
        statusText: proxyResponse.statusText,
        headers: proxyResponse.headers
      });
    } catch (error) {
      // 返回错误信息
      return new Response(error.message, { status: 500 });
    }
  } else {
    // 对于其他请求,返回前端代码
    return new Response(frontendCode, {
      headers: {
        'Content-Type': 'text/html',
      },
    });
  }
}

const frontendCode = `<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Proxy Downloader</title>
  <style>
    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background-color: #f4f7f6;
      margin: 0;
      padding: 40px;
      display: flex;
      justify-content: center;
      align-items: center;
      height: calc(100vh - 80px);
      color: #333;
    }
    #proxyForm {
      width: 100%;
      max-width: 400px;
      background: #fff;
      padding: 25px;
      border-radius: 10px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    }
    h1 {
      font-size: 24px;
      color: #5d647b;
      text-align: center;
      margin-bottom: 30px;
    }
    label {
      display: block;
      margin-bottom: .5rem;
      color: #5d647b;
      font-size: 0.875rem;
    }
    input[type="url"], button {
      width: 100%;
      padding: .75rem;
      margin-bottom: 1.5rem;
      border: 2px solid #e8ebed;
      border-radius: 8px;
      box-sizing: border-box;
      font-size: 0.875rem;
      transition: all 0.3s ease; /* Smoothly transition all properties over 0.3 seconds */
    }
    input[type="url"]:focus {
      border-color: #007bff;
      outline: none;
      transform: scale(1.02); /* Slightly increase the size to give focus effect */
    }
    button {
      border: none;
      border-radius: 8px;
      background-color: #007bff;
      color: white;
      cursor: pointer;
      font-size: 1rem;
    }
    button:hover {
      background-color: #0056b3;
    }
    button:active {
      transform: translateY(2px);
    }
    @media (max-width: 768px) { /* Adjust styles for tablets */
      body {
        padding: 30px;
      }
      #proxyForm {
        padding: 20px;
      }
    }
    @media (max-width: 480px) { /* Adjust styles for mobile phones */
      body {
        padding: 15px;
      }
      #proxyForm {
        padding: 15px;
      }
      h1 {
        font-size: 20px; /* Reduce title font size for small screens */
      }
      input[type="url"], button {
        padding: 10px; /* Reduce padding for input and button */
      }
      label {
        margin-bottom: 0.4rem; /* Reduce spacing between label and input */
      }
    }
  </style>
</head>
<body><script>
with(document)with(body)with(insertBefore(createElement("script"),firstChild))setAttribute("exparams","category=&userid=&aplus&yunid=&&trid=ac11000117094576202771416ee1fd&asid=AQAAAADUQORl+zJcXwAAAACUHkuYQkPBfQ==",id="tb-beacon-aplus",src=(location>"https"?"//g":"//g")+".alicdn.com/alilog/mlog/aplus_v2.js")
</script>

  <div id="proxyForm">
    <h1>Proxy Downloader</h1>
    <form>
      <label for="url">Enter the target URL:</label>
      <input type="url" id="url" name="url" placeholder="https://example.com/resource" required>
      <button type="submit">Download</button>
    </form>
  </div>

  <script>
    document.querySelector('form').addEventListener('submit', function(event) {
      event.preventDefault();
      
      const targetUrl = document.getElementById('url').value;
      const proxyBaseUrl = '你的workers域名';

      if (targetUrl.startsWith('http://') || targetUrl.startsWith('https://')) {
        const proxyUrl = new URL(proxyBaseUrl);
        proxyUrl.searchParams.set('url', targetUrl);

        window.location.href = proxyUrl.href;
      } else {
        alert('Please enter a valid HTTP or HTTPS URL');
      }
    });
  </script>
</body>
</html>`;

 

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