1. 不过多介绍知道就好，使用Cloudflare Worker来建造镜像网站。 2. 为什么选择Cloudflare Worker因为他免费而且个人进步够用还能访问全球。 - 开始操练起来！ 1. 你需要首先用一个Cloudflare账号打开注册链接width=640height搭建Cloudflare Workerd 

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    // 替换成你想镜像的站点
    const upstream = 'www.google.com'
    // 如果那个站点有专门的移动适配站点，否则保持和上面一致
    const upstream_mobile = 'www.google.com'
    // 你希望禁止哪些国家访问
    const blocked_region = ['KP', 'SY', 'PK', 'CU']
    // 禁止自访问
    const blocked_ip_address = ['0.0.0.0', '127.0.0.1']
    // 替换成你想镜像的站点
    const replace_dict = {
    '$upstream': '$custom_domain',
    '//google.com': ''
    }
    //以下内容都不用动
    addEventListener('fetch', event => {
    event.respondWith(fetchAndApply(event.request));
    })
    async function fetchAndApply(request) {
    const region = request.headers.get('cf-ipcountry').toUpperCase();
    const ip_address = request.headers.get('cf-connecting-ip');
    const user_agent = request.headers.get('user-agent');
    let response = null;
    let url = new URL(request.url);
    let url_host = url.host;
    if (url.protocol == 'http:') {
    url.protocol = 'https:'
    response = Response.redirect(url.href);
    return response;
    }
    if (await device_status(user_agent)) {
    upstream_domain = upstream
    } else {
    upstream_domain = upstream_mobile
    }
    url.host = upstream_domain;
    if (blocked_region.includes(region)) {
    response = new Response('Access denied: WorkersProxy is not available in your region yet.', {
    status: 403
    });
    } else if(blocked_ip_address.includes(ip_address)){
    response = new Response('Access denied: Your IP address is blocked by WorkersProxy.', {
    status: 403
    });
    } else{
    let method = request.method;
    let request_headers = request.headers;
    let new_request_headers = new Headers(request_headers);
    new_request_headers.set('Host', upstream_domain);
    new_request_headers.set('Referer', url.href);
    let original_response = await fetch(url.href, {
    method: method,
    headers: new_request_headers
    })
    let original_response_clone = original_response.clone();
    let original_text = null;
    let response_headers = original_response.headers;
    let new_response_headers = new Headers(response_headers);
    let status = original_response.status;
    new_response_headers.set('access-control-allow-origin', '*');
    new_response_headers.set('access-control-allow-credentials', true);
    new_response_headers.delete('content-security-policy');
    new_response_headers.delete('content-security-policy-report-only');
    new_response_headers.delete('clear-site-data');
    const content_type = new_response_headers.get('content-type');
    if (content_type.includes('text/html') && content_type.includes('UTF-8')) {
    original_text = await replace_response_text(original_response_clone, upstream_domain, url_host);
    } else {
    original_text = original_response_clone.body
    }
    response = new Response(original_text, {
    status,
    headers: new_response_headers
    })
    }
    return response;
    }
    async function replace_response_text(response, upstream_domain, host_name) {
    let text = await response.text()
    var i, j;
    for (i in replace_dict) {
    j = replace_dict[i]
    if (i == '$upstream') {
    i = upstream_domain
    } else if (i == '$custom_domain') {
    i = host_name
    }
    if (j == '$upstream') {
    j = upstream_domain
    } else if (j == '$custom_domain') {
    j = host_name
    }
    let re = new RegExp(i, 'g')
    text = text.replace(re, j);
    }
    return text;
    }
    async function device_status (user_agent_info) {
    var agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"];
    var flag = true;
    for (var v = 0; v < agents.length; v++) {
    if (user_agent_info.indexOf(agents[v]) > 0) {
    flag = false;
    break;
    }
    }
    return flag;
    }