%% You should probably cite rfc4229 instead of this I-D.
@techreport{nottingham-hdrreg-http-05,
    number =    {draft-nottingham-hdrreg-http-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-nottingham-hdrreg-http/05/},
    author =    {Mark Nottingham and Jeffrey Mogul},
    title =     {{HTTP Header Field Registrations}},
    pagetotal = 53,
    year =      2005,
    month =     jun,
    day =       29,
    abstract =  {This document defines the initial contents of a permanent IANA registry for HTTP header fields and a provisional repository for HTTP header fields, per RFC 3864. This memo provides information for the Internet community.},
}