在使用Cloudflare CDN时，CDN传给后端服务器中只传递了有限的 http request hearder。
其中只包含了非常简陋的 ip 信息，例如只有 CF-IPCountry ，不足以实现一个查询ip信息的api，要想实现查询ip详细信息需要借助 Cloudflare Workers 来实现。

Cloudflare Workers 传入的 HTTP 请求都被称为 fetch 事件，fetch 事件中都包含一个 Request 接口实例,在这个 Request 实例中就包括了访问 ip 的详细信息

通过访问 Request.cf 可以获得 Cloudflare 提供的请求信息，包含了 ip 的详细信息；访问 Request.headers 则可以获得访客的 HTTP headers，写一个简单的 Workers 处理一下 Request.cf 、Request.headers 中的信息，并返回 Json 格式即可。

访问该 Cloudflare Workers 后返回包含访客 IP、Continent、Country、Region、ASN 等 ip 信息及请求的Header信息，同时也会把 Cloudflare 的 https 连接信息及 bot 识别的相关信息一起返回。

代码如下：

export default {
  async fetch(request) {
    const data = {
      Method: request.method,
      Url: request.url,
      IP: {
        IP: request.headers.get('CF-Connecting-IP'),
        Continent: request.cf.continent,
        Country: request.cf.country,
        IsEU: request.cf.isEUCountry,
        Region: request.cf.region,
        RegionCode: request.cf.regionCode,
        City: request.cf.city,
        Latitude: request.cf.latitude,
        Longitude: request.cf.longitude,
        PostalCode: request.cf.postalCode,
        MetroCode: request.cf.metroCode,
        Colo: request.cf.colo,
        ASN: request.cf.asn,
        ASOrganization: request.cf.asOrganization,
        Timezone: request.cf.timezone
      },
      Headers: {},
      Security: {}
    };

 // 遍历并存储每个 HTTP 头，排除以 cf- 开头的 HTTP 头
 request.headers.forEach((value, name) => {
  if (!name.toLowerCase().startsWith('cf-')) {
    data.Headers[name] = value;
  }
});

    // 遍历 request.cf 并存储所需对象的属性到 Security 中
    for (const key in request.cf) {
      if (
          key == 'clientTcpRtt' 
          || key == 'tlsCipher'
          || key == 'tlsVersion'
          || key == 'httpProtocol'
          || key == 'clientHandshake'
          || key == 'clientFinished'
          || key == 'serverHandshake'
          || key == 'serverFinished'
          || key == 'corporateProxy' 
          || key == 'verifiedBot' 
          || key == 'score'
          
          ) {
      if (typeof request.cf[key] === 'object') {
        for (const innerKey in request.cf[key]) {
          data.Security[innerKey] = request.cf[key][innerKey];
        }
      } else {
        data.Security[key] = request.cf[key];
      }
    }
    }

    var dataJson = JSON.stringify(data, null, 4);
    console.log(dataJson);

    return new Response(dataJson, {
      headers: {
        "Content-Type": "application/json;charset=UTF-8"
      }
    })
  }
};

需要注意 Cloudflare Workers 的域名被屏蔽了，建议绑定一个域名来访问。请求该 Workers 后返回如下 JSON ：

{
    "Method": "GET",
    "Url": "https://ip.ipip.dev/",
    "IP": {
        "IP": "149.234.194.181",
        "Continent": "NA",
        "Country": "US",
        "Region": "Missouri",
        "RegionCode": "MO",
        "Latitude": "38.57740",
        "Longitude": "-90.67090",
        "Colo": "IAD",
        "ASN": 23167,
        "ASOrganization": "Bayer-arch",
        "Timezone": "America/Chicago"
    },
    "Headers": {
        "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
        "accept-encoding": "gzip",
        "accept-language": "en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7",
        "connection": "Keep-Alive",
        "host": "ip.ipip.dev",
        "sec-ch-ua": "\"Not/A)Brand\";v=\"99\", \"Google Chrome\";v=\"115\", \"Chromium\";v=\"115\"",
        "sec-ch-ua-mobile": "?0",
        "sec-ch-ua-platform": "\"Windows\"",
        "sec-fetch-dest": "document",
        "sec-fetch-mode": "navigate",
        "sec-fetch-site": "none",
        "sec-fetch-user": "?1",
        "upgrade-insecure-requests": "1",
        "user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36",
        "x-forwarded-proto": "https",
        "x-real-ip": "149.234.194.181"
    },
    "Security": {
        "clientTcpRtt": 1,
        "tlsCipher": "AEAD-AES128-GCM-SHA256",
        "tlsVersion": "TLSv1.3",
        "httpProtocol": "HTTP/2"
    }
}