使用CloudFlare优选任何网站！

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// 域名前缀映射配置
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// 示例：'cf-blog.7o.nz': 'cf-blog.'
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// 则 Worker 路由 cf-blog.* 都会反代到 cf-blog.7o.nz
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const domain_mappings = {
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  '源站.com': '最终访问头.',
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};
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addEventListener('fetch', event => {
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  event.respondWith(handleRequest(event.request));
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});
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async function handleRequest(request) {
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  const url = new URL(request.url);
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  const current_host = url.host;
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  // 强制使用 HTTPS
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  if (url.protocol === 'http:') {
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    url.protocol = 'https:';
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    return Response.redirect(url.href, 301);
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  }
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  const host_prefix = getProxyPrefix(current_host);
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  if (!host_prefix) {
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    return new Response('Proxy prefix not matched', { status: 404 });
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  }
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  // 查找对应目标域名
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  let target_host = null;
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  for (const [origin_domain, prefix] of Object.entries(domain_mappings)) {
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    if (host_prefix === prefix) {
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      target_host = origin_domain;
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      break;
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    }
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  }
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  if (!target_host) {
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    return new Response('No matching target host for prefix', { status: 404 });
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  }
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  // 构造目标 URL
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  const new_url = new URL(request.url);
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  new_url.protocol = 'https:';
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  new_url.host = target_host;
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  // 创建新请求
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  const new_headers = new Headers(request.headers);
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  new_headers.set('Host', target_host);
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  new_headers.set('Referer', new_url.href);
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  try {
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    const response = await fetch(new_url.href, {
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      method: request.method,
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      headers: new_headers,
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      body: request.method !== 'GET' && request.method !== 'HEAD' ? request.body : undefined,
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      redirect: 'manual'
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    });
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    // 复制响应头并添加CORS
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    const response_headers = new Headers(response.headers);
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    response_headers.set('access-control-allow-origin', '*');
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    response_headers.set('access-control-allow-credentials', 'true');
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    response_headers.set('cache-control', 'public, max-age=600');
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    response_headers.delete('content-security-policy');
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    response_headers.delete('content-security-policy-report-only');
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    return new Response(response.body, {
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      status: response.status,
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      statusText: response.statusText,
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      headers: response_headers
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    });
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  } catch (err) {
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    return new Response(`Proxy Error: ${err.message}`, { status: 502 });
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  }
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}
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function getProxyPrefix(hostname) {
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  for (const prefix of Object.values(domain_mappings)) {
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    if (hostname.startsWith(prefix)) {
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      return prefix;
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    }
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  }
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  return null;
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}