flashlight-checker is a web app that allows checking connectivity to a flashlight instance over the internet.

To use, simply make a GET request to http://flashlight-checker.herokuapp.com/, for example:

curl -I http://flashlight-checker.herokuapp.com/ 

The app will attempt to proxy a HEAD request to http://www.google.com/humans.txt via a flashlight running on the IP address from which the request was received, and on port 443.

If successful, the request returns a 200 status code. If unsuccessful, it returns a 504.