%% You should probably cite rfc8674 instead of this I-D.
@techreport{nottingham-safe-hint-09,
    number =    {draft-nottingham-safe-hint-09},
    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/09/},
    author =    {Mark Nottingham},
    title =     {{The "safe" HTTP Preference}},
    pagetotal = 8,
    year =      2019,
    month =     apr,
    day =       17,
    abstract =  {This specification defines a "safe" preference for HTTP requests that expresses a desire to avoid objectionable content, according to the definition of that term by the origin server. Support for this preference by clients and servers is optional.},
}