localtunnel is(was?) an awesome utility to temporarily expose a local HTTP server to the world (useful for testing webhooks, among other things). I hadn't needed it for a while, and was sad to learn today that the service is down, apparently:

~/code/incoming ‹master› » localtunnel 4567
[Error] Unable to register tunnel. Perhaps service is down?

All is not lost: the solution is to use ngrok, which may eventually be merged with localtunnel.