%% You should probably cite draft-ietf-httpbis-conditional instead of this I-D.
@techreport{fielding-httpbis-http-conditional-00,
    number =    {draft-fielding-httpbis-http-conditional-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-fielding-httpbis-http-conditional/00/},
    author =    {Roy T. Fielding and Julian Reschke},
    title =     {{Hypertext Transfer Protocol (HTTP): Conditional Requests}},
    pagetotal = 27,
    year =      2018,
    month =     mar,
    day =       5,
    abstract =  {The Hypertext Transfer Protocol (HTTP) is a stateless application- level protocol for distributed, collaborative, hypertext information systems. This document defines HTTP/1.1 conditional requests, including metadata header fields for indicating state changes, request header fields for making preconditions on such state, and rules for constructing the responses to a conditional request when one or more preconditions evaluate to false. This document obsoletes RFC 7232.},
}