%% You should probably cite rfc9875 instead of this I-D.
@techreport{ietf-httpbis-cache-groups-00,
    number =    {draft-ietf-httpbis-cache-groups-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-ietf-httpbis-cache-groups/00/},
    author =    {Mark Nottingham},
    title =     {{HTTP Cache Groups}},
    pagetotal = 6,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This specification introduces a means of describing the relationships between stored responses in HTTP caches, "grouping" them by associating a stored response with one or more opaque strings.},
}