使用Cloudflare workers反代OpenAI API
在Cloudflare新建一个worker，填入以下代码即可。代码来源于GitHub，版权归原作者所有。
// 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;}
还有一种更简单的方法，目前Cloudflare提供了官方的OpenAI api反代，即Cloudflare AI Gateway，具体看这里：https://developers.cloudflare.com/ai-gateway/providers/openai/，格式是https://gateway.ai.cloudflare.com/v1/ACCOUNT_TAG/GATEWAY/openai
登录自己的Cloudflare账号即可看到具体的api地址。
