Reliable HTTP: A New Protocol
http://www.hyperwrite.com/Articles/showarticle.aspx?id=37

HyperWrite
2004

Abstract:

HTTPR aims to ensure that a Web transmission gets delivered to its destination only once, or gets reported as undeliverable. HTTPR is geared toward business-to-business communications over the Web, such as paying a bill or processing a purchase order, where a request must be delivered once and only once to its intended receiver.