CloudFlare Worker reverse proxy for Openai

Mainly solve the problems of being intercepted by the official website and slow access in China#

addEventListener('fetch', event => {
    event.respondWith(fetchAndApply(event.request));
})

async function fetchAndApply(request) {

    let response = null;
    let method = request.method;


    let url = new URL(request.url);
    let url_hostname = url.hostname;
    url.protocol = 'https:';
    url.host = 'api.openai.com';


    let request_headers = request.headers;
    let new_request_headers = new Headers(request_headers);
    new_request_headers.set('Host', url.host);
    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
    })
  

    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('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');

    original_text = original_response_clone.body
    response = new Response(original_text, {
        status,
        headers: new_response_headers
    })

    return response

}

Although it can be implemented, it may cause the account to be blocked. It is recommended to use your own VPS reverse proxy.

Nginx configuration reverse proxy#

Open the Nginx configuration file (usually /etc/nginx/nginx.conf).
Add the following code within the http block:

server {
    listen 80;
    server_name yourdomain.com; # Replace with your own domain name

    location / {
        return 301 https://$host$request_uri;
    }
}

server {
    listen 443 ssl;
    server_name yourdomain.com; # Replace with your own domain name

    ssl_certificate /path/to/your/certificate.crt;
    ssl_certificate_key /path/to/your/certificate.key;

    location / {
        proxy_pass https://api.openai.com;
         proxy_set_header Host api.openai.com;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
       add_header 'Cache-Control' 'no-store';
    }
}

There are two servers, one listening on port 80, which redirects all HTTP requests to HTTPS; the other listening on port 443 and enabling SSL, which handles HTTPS requests. We use location / to define a proxy server, so when users request this directory, Nginx will forward it to https://api.openai.com.

Please note that you should replace yourdomain.com with your own domain name, and replace /path/to/your/certificate.crt and /path/to/your/certificate.key with your SSL certificate paths.