使用阿里云ESA边缘函数获取访问用户IP

async function handleRequest(request) {
    const url = new URL(request.url);
    const path = url.pathname;
    const ip = request.headers.get('x-forwarded-for')?.split(',')[0]||request.headers.get('x-alicdn-security-xff')
    if(path==='/'){
        return new Response(ip, {
            headers: {
            "content-type": "text/html;charset=UTF-8",
            },
        })
    } else if(path==='/json'){
        return new Response(JSON.stringify({ ip }), {
        headers: {
            'content-type': 'application/json',
        },
        });
    } else if(path==='/info'){
        const info = {
            ip,
            geo: request.info
        }
        return new Response(JSON.stringify({ info }), {
            headers: {
                'content-type': 'application/json',
            },
        });
    } else {
        return new Response("404", {status: 404})
    }
    
}

export default {
  async fetch(request) {
    return handleRequest(request);
  }
};

获取访问IP（支持IPv6）