在Next的服务器端环境中，您可以访问req.headers.host以及Vercel或其他平台的反向代理设置的其他头文件，以告知请求的实际来源，如下所示：
/pages/api/some-api-route.ts：

import { NextApiRequest } from "next";

const LOCAL_HOST_ADDRESS = "localhost:3000";

export default async function handler(req: NextApiRequest) {
  let host = req.headers?.host || LOCAL_HOST_ADDRESS;
  let protocol = /^localhost(:\d+)?$/.test(host) ? "http:" : "https:";

  // If server sits behind reverse proxy/load balancer, get the "actual" host ...
  if (
    req.headers["x-forwarded-host"] &&
    typeof req.headers["x-forwarded-host"] === "string"
  ) {
    host = req.headers["x-forwarded-host"];
  }

  // ... and protocol:
  if (
    req.headers["x-forwarded-proto"] &&
    typeof req.headers["x-forwarded-proto"] === "string"
  ) {
    protocol = `${req.headers["x-forwarded-proto"]}:`;
  }

  let someRandomToken;
  const yourTokenPayload = {
    token: someRandomToken,
    origin: protocol + "//" + host, // e.g. http://localhost:3000 or https://mywebsite.net
  };

  // [...]
}

使用Typescript在挖掘属性时确实很有帮助，就像在这个例子中一样。我不知道你是否在使用Typescript，但是如果你没有，你必须删除NextApiRequest。