使用Cloudflare Workers反代网站 Workers 的工作原理就是最近几年火热的 serverless。网站管理员不再一定需要一个服务器，只需要将对应的 Function 托管在 Workers 上，当用户访问网站时就会执行对应的 Function，值得一提的是 Cloudflare Workers 本质上只支持 JS反代代码// 需要反代的地址 const upstream = 'www.example.com' // 反代地址的子路径 const upstreamPath = '/' // 反代网站的移动端域名 const upstreamMobile = 'www.example.com' // 是否使用 https const useHttps = true // 禁止使用该 worker 的国家代码 const blockedRegion = ['KP', 'SY', 'PK', 'CU'] // 禁止使用该 worker 的 ip 地址 const blockedIp = ['0.0.0.0', '127.0.0.1'] // 是否关闭缓存 const disableCache = false // 替换条件 const contentTypes = [ 'text/plain', 'text/html' ] // 反代网站中其他需要被替换的地址 const replaceDict = { '$upstream': '$workerDomain', } addEventListener('fetch', event => { event.respondWith(handleRequest(event.request)) }) /** * Respond to the request * @param {Request} request */ async function handleRequest(request) { const region = request.headers.get('cf-ipcountry') || ''; const ip = request.headers.get('cf-connecting-ip'); if (blockedRegion.includes(region.toUpperCase())) { return new Response('Access denied: WorkersProxy is not available in your region yet.', { status: 403 }); } if (blockedIp.includes(ip)) { return new Response('Access denied: Your IP address is blocked by WorkersProxy.', { status: 403 }); } const upstreamDomain = isMobile(request.headers.get('user-agent')) ? upstreamMobile : upstream; // 构建上游请求地址 let url = new URL(request.url); const workerDomain = url.host; url.protocol = useHttps ? 'https:' : 'http'; url.pathname = url.pathname === '/' ? upstreamPath : upstreamPath + url.pathname; url.host = upstreamDomain; // 构建上游请求头 const newRequestHeaders = new Headers(request.headers); newRequestHeaders.set('Host', upstreamDomain); newRequestHeaders.set('Referer', url.protocol + '//' + workerDomain); // 获取上游响应 const originalResponse = await fetch(url.href, { method: request.method, headers: newRequestHeaders }) const connectionUpgrade = newRequestHeaders.get("Upgrade"); if (connectionUpgrade && connectionUpgrade.toLowerCase() === "websocket") { return originalResponse; } let originalResponseClone = originalResponse.clone(); // 构建响应头 let responseHeaders = originalResponseClone.headers; let newResponseHeaders = buildResponseHeaders(responseHeaders); if (newResponseHeaders.get("x-pjax-url")) { newResponseHeaders.set("x-pjax-url", responseHeaders.get("x-pjax-url").replace("//" + upstreamDomain, "//" + workerDomain)); } // 构建响应体 let originalText; const contentType = newResponseHeaders.get('content-type'); if (contentType != null) { const types = contentType.replace(' ','').split(';') if (types.includes('charset=utf-8')){ for (let i of contentTypes) { if (types.includes(i)){ originalText = await replaceResponseText(originalResponseClone, upstreamDomain, workerDomain); break } } } } else { originalText = originalResponseClone.body } return new Response(originalText, { status: originalResponseClone.status, headers: newResponseHeaders }) } function isMobile(userAgent) { userAgent = userAgent || '' let agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"]; for (let v = 0; v < agents.length; v++) { if (userAgent.indexOf(agents[v]) > 0) { return true; } } } function buildResponseHeaders(originalHeaders) { const result = new Headers(originalHeaders); if (disableCache) { result.set('Cache-Control', 'no-store'); } result.set('access-control-allow-origin', '*'); result.set('access-control-allow-credentials', true); result.delete('content-security-policy'); result.delete('content-security-policy-report-only'); result.delete('clear-site-data'); return result } async function replaceResponseText(response, upstreamDomain, workerDomain) { let text = await response.text() const placeholders = { "$upstream": upstreamDomain, "$workerDomain": workerDomain } for (let origin in replaceDict) { let target = replaceDict[origin] origin = placeholders[origin] || origin target = placeholders[target] || target const re = new RegExp(origin, 'g') text = text.replace(re, target); } return text; }