为什么cloudflare配置Gemini的代理用不了

const TELEGRAPH_URL = 'https://generativelanguage.googleapis.com/';

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

async function handleRequest(request) {
const url = new URL(request.url);
url.host = TELEGRAPH_URL.replace(/^https?:\/\//, '');

const modifiedRequest = new Request(url.toString(), {
headers: request.headers,
method: request.method,
body: request.body,
redirect: 'follow'
});

const response = await fetch(modifiedRequest);
const modifiedResponse = new Response(response.body, response);

// 添加允许跨域访问的响应头
modifiedResponse.headers.set('Access-Control-Allow-Origin', '*');

return modifiedResponse;
}

我把openai的网址换成Gemini的为啥用不了，填openAI的网址国内可以访问。