%% You should probably cite rfc7234 instead of this I-D. @techreport{ietf-httpbis-p6-cache-21, number = {draft-ietf-httpbis-p6-cache-21}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-httpbis-p6-cache/21/}, author = {Roy T. Fielding and Mark Nottingham and Julian Reschke}, title = {{Hypertext Transfer Protocol (HTTP/1.1): Caching}}, pagetotal = 41, year = 2012, month = oct, day = 4, abstract = {The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypertext information systems. This document defines requirements on HTTP caches and the associated header fields that control cache behavior or indicate cacheable response messages.}, }