Localtunnel is a pioneering tunneling project created to expose services running on localhost to the public Internet. The repository now contains a minimal third-generation implementation written in Go. Version 3 uses Progrium’s Duplex project to keep the tunneling implementation extremely small, at under roughly 200 lines. It is usable as a tunneling foundation, but the project no longer operates an official public tunnel server. The repository also preserves earlier implementations as...