事前准备
你需要将你的没有被 GFW 域名使用ns的方式转入Cloudflare，否则你将只能使用Cloudflare给你准备的子域名。
创建一个 Cloudflare Worker
登录到 Cloudflare 的管理界面后，点击侧边栏的 “Workers” 选项，点击 “创建服务” 创建一个 Worker。
给服务名称命名“apiopenai”后选择“HTTP处理程序”，然后点击 “创建服务” 创建一个 Worker。
创建完成后，其中例图里的
apiopenai.admincmliunet.workers.dev正是由Cloudflare 提供的子域名反代的地址，但是当前api反代并未生效，你需要点击右上角“快速编辑”
清空默认代码后将noobnooc大佬github上
cloudflare-worker-proxy.js里的代码粘贴到至代码框后点击“保存并部署”(打不开github也可以直接复制文章结尾处的代码)
此时已得到由Cloudflare 提供的子域名反代的openai的api地址：
apiopenai.admincmliunet.workers.dev
接下来添加自己的域名来实现自己的api地址，返回上一级选择“触发器”选项点击“添加自定义域”
在域里填入你接入Cloudflare域名的子域名，
例如：我接入的域名是cmliu.cf，所以填入api.cmliu.cf
后点击添加“添加自定义域”后完成
完成
此时你已经完成对api.openai.com的反代设置
Cloudflare Worker每日有10W次的请求量，轻度使用基本用不完，如果你怕麻烦也可以直接使用我生成的反代api地址。
反代地址：
https://api.cmliu.cf
https://apiopenai.admincmliunet.workers.dev
noobnooc大佬的cloudflare-worker-proxy.js代码
// 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;
}
