%% You should probably cite draft-ietf-httpbis-variants-06 instead of this revision.
@techreport{ietf-httpbis-variants-05,
    number =    {draft-ietf-httpbis-variants-05},
    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-variants/05/},
    author =    {Mark Nottingham},
    title =     {{HTTP Representation Variants}},
    pagetotal = 21,
    year =      2019,
    month =     mar,
    day =       25,
    abstract =  {This specification introduces an alternative way to communicate a secondary cache key for a HTTP resource, using the HTTP "Variants" and "Variant-Key" response header fields. Its aim is to make HTTP proactive content negotiation more cache-friendly.},
}