%% You should probably cite rfc5861 instead of this I-D.
@techreport{nottingham-http-stale-controls-00,
    number =    {draft-nottingham-http-stale-controls-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-nottingham-http-stale-controls/00/},
    author =    {Mark Nottingham},
    title =     {{HTTP Cache-Control Extensions for Stale Content}},
    pagetotal = 6,
    year =      2008,
    month =     nov,
    day =       28,
    abstract =  {This document defines two independent HTTP Cache-Control extensions that allow control over the use of stale responses by caches. This document is not an Internet Standards Track specification; it is published for informational purposes.},
}