localhost.run is a client-less tool to instantly make a locally running application available on an internet accessible URL.
This is quick way to start the localhost.run and connect local PORT to internet domain. If you are using a free tunnel you can skip the SSH key check by adding "nokey" as your SSH user (use [USERNAME]@localhost.run instead of localhost.run) otherwise you need to upload your public SSH key to https://admin.localhost.run/.
ssh -R 80:127.0.0.1:<PORT> localhost.run