Vercel Serverless Function for getting redirected URL from short-link services

redirect.ts

import got from "got";
import { VercelRequest, VercelResponse } from "@vercel/node";

const redirect = async (request: VercelRequest, response: VercelResponse) => {
  const url: string | undefined =
    (request.query && request.query.url) || (request.body && request.body.url);

  if (
    (request.method === "GET" || request.method === "POST") &&
    typeof url === "string" &&
    (url.startsWith("http://") || url.startsWith("https://"))
  ) {
    const redirectedUrlResponse = await got(url, { method: "GET" }).catch(
      (e) => {
        console.error(e);
        return null;
      }
    );

    if (redirectedUrlResponse) {
      return response.redirect(redirectedUrlResponse.url);
    } else {
      return response.status(500).send("Server Error");
    }
  }

  return response.status(400).send("Invalid Request");
};

export default redirect;