UDP [ Reliable_protocol_wrapper [ HTTP ] ] Where Reliable_protocol_wrapper does retransmissions, acks, sequence numbering etc. There's no reason why you could

UDP [ Reliable_protocol_wrapper [ HTTP ] ] Where Reliable_protocol_wrapper does retransmissions, acks, sequence numbering etc. There's no reason why you couldn't use HTTP over UDP if you like, I'm sure it's most likely been done in the past - if only just for fun.