%% You should probably cite rfc8594 instead of this I-D.
@techreport{wilde-sunset-header-11,
    number =    {draft-wilde-sunset-header-11},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-wilde-sunset-header/11/},
    author =    {Erik Wilde},
    title =     {{The Sunset HTTP Header Field}},
    pagetotal = 11,
    year =      2019,
    month =     feb,
    day =       22,
    abstract =  {This specification defines the Sunset HTTP response header field, which indicates that a URI is likely to become unresponsive at a specified point in the future. It also defines a sunset link relation type that allows linking to resources providing information about an upcoming resource or service sunset.},
}