%% You should probably cite rfc8674 instead of this I-D.
@techreport{nottingham-safe-hint-02,
    number =    {draft-nottingham-safe-hint-02},
    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-safe-hint/02/},
    author =    {Mark Nottingham},
    title =     {{The "safe" HTTP Preference}},
    pagetotal = 7,
    year =      2014,
    month =     may,
    day =       30,
    abstract =  {This specification defines a "safe" preference for HTTP, expressing a user preference to avoid "objectionable" content.},
}