Cloudflare Workers

myip.js

/**
* Return your IPv4 or IPv6 address
*/

addEventListener('fetch', event => {
 event.respondWith(handleRequest(event.request))
})
 
/**
* Respond to the request
* @param {Request} request
*/
async function handleRequest(e) {
 
   let a = '';
   for (const element of e.headers) {
       a = a.concat(element[0], " => ", element[1], "\n")
   }


 var host = e.headers.get("host")
 var ip = e.headers.get("cf-connecting-ip")
 return new Response(ip, {status: 200})
}

I use this worker as a simple page to check my public IP address. Very useful when scripting for Mikrotik, bash and what else.