@misc{rfc7232,
    series =    {Request for Comments},
    number =    7232,
    howpublished =  {RFC 7232},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC7232},
    url =       {https://www.rfc-editor.org/info/rfc7232},
    author =    {Roy T. Fielding and Julian Reschke},
    title =     {{Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests}},
    pagetotal = 28,
    year =      2014,
    month =     jun,
    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.},
}