See also: Security | HTTP | SSL
Secure HyperText Transfer Protocol
An encrypted HyperText Transfer Protocol. It was more secure than HTTPS but harder to set up. It did not took of and it’s doubtful you’ll find any deployment in the wild.
A very good description and a comparaison against HTTPS is available in the Eric Rescorla‘s book SSL and TLS: Designing and Building Secure Systems ISBN 0201615983
TakeDown.NET -> “SHTTP”