CloudFlare反向代理api（以api.openai.com为例）

注册CloudFlare并且登录

好像还要先完成邮箱验证（反正也是点个链接的事情）

ATT：CF不需要挂梯子即可注册登录

初始化项目

点击左侧Workers按钮

直接创建helloword worker

部署项目

删除左侧代码后将新的反向代理代码粘贴至左侧，然后点击保存并且部署（Save and deploy），最后点击左上角返回，记得要保存

这里我给出openai的api的借口反代代码（见文末）

在worker的面板点进去刚刚的项目可以看到反代后的网站的url

自定义域名（可选）

当你把你的域名托管到CloudFlare的时候，你可以自己添加域名替代反代后的url

在点进worker项目里面的时候选择触发器（Triggers），选择添加域名，CF会自动配置好SSL以及DSN解析

建议，直接在 CloudFlare 买一个域名，便宜的 2美金，免得转移域名过来，整得那么麻烦，这里买了就可以用，还不用备案，快捷

//代码开始

// Website you intended to retrieve for users.
const upstream = 'api.openai.com'

// Custom pathname for the upstream website.
const upstream_path = '/'

// Website you intended to retrieve for users using mobile devices.
const upstream_mobile = upstream

// Countries and regions where you wish to suspend your service.
const blocked_region = []

// IP addresses which you wish to block from using your service.
const blocked_ip_address = ['0.0.0.0', '127.0.0.1']

// Whether to use HTTPS protocol for upstream address.
const https = true

// Whether to disable cache.
const disable_cache = false

// Replace texts.
const replace_dict = {
'$upstream': '$custom_domain',
}

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_hostname = url.hostname;

if (https == true) {
url.protocol = 'https:';
} else {
url.protocol = 'http:';
}

if (await device_status(user_agent)) {
var upstream_domain = upstream;
} else {
var upstream_domain = upstream_mobile;
}

url.host = upstream_domain;
if (url.pathname == '/') {
url.pathname = upstream_path;
} else {
url.pathname = upstream_path + url.pathname;
}

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.protocol + '//' + url_hostname);

let original_response = await fetch(url.href, {
method: method,
headers: new_request_headers,
body: request.body
})

connection_upgrade = new_request_headers.get("Upgrade");
if (connection_upgrade && connection_upgrade.toLowerCase() == "websocket") {
return original_response;
}

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;

if (disable_cache) {
new_response_headers.set('Cache-Control', 'no-store');
}

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');

if (new_response_headers.get("x-pjax-url")) {
new_response_headers.set("x-pjax-url", response_headers.get("x-pjax-url").replace("//" + upstream_domain, "//" + url_hostname));
}

const content_type = new_response_headers.get('content-type');
if (content_type != null && content_type.includes('text/html') && content_type.includes('UTF-8')) {
original_text = await replace_response_text(original_response_clone, upstream_domain, url_hostname);
} 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;
}

//代码完毕

浏览器里面访问你的  worker 域名

如果看到下面这样的界面，就是成功了，恭喜你