%% You should probably cite draft-ietf-httpbis-semantics instead of this I-D.
@techreport{ietf-httpbis-conditional-01,
    number =    {draft-ietf-httpbis-conditional-01},
    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-conditional/01/},
    author =    {Roy T. Fielding and Mark Nottingham and Julian Reschke},
    title =     {{HTTP Conditional Requests}},
    pagetotal = 4,
    year =      2018,
    month =     may,
    day =       31,
    abstract =  {The Hypertext Transfer Protocol (HTTP) is a stateless application- level protocol for distributed, collaborative, hypertext information systems. This document formerly defined HTTP conditional requests, which has since been moved to the core HTTP Semantics document.},
}