%% You should probably cite draft-ietf-httpbis-auth-info instead of this I-D.
@techreport{reschke-httpauth-auth-info-00,
    number =    {draft-reschke-httpauth-auth-info-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-reschke-httpauth-auth-info/00/},
    author =    {Julian Reschke},
    title =     {{The Hypertext Transfer Protocol (HTTP) Authentication-Info Header Field}},
    pagetotal = 5,
    year =      2015,
    month =     jan,
    day =       24,
    abstract =  {This specification defines the "Authentication-Info" and "Proxy- Authentication-Info" header fields for use in HTTP authentication schemes which need to return additional information during or after authentication.},
}