%% You should probably cite draft-ietf-httpbis-header-structure instead of this I-D.
@techreport{kamp-httpbis-structure-01,
    number =    {draft-kamp-httpbis-structure-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-kamp-httpbis-structure/01/},
    author =    {Poul-Henning Kamp},
    title =     {{HTTP header common structure}},
    pagetotal = 13,
    year =      2016,
    month =     oct,
    day =       30,
    abstract =  {An abstract data model for HTTP headers, "Common Structure", and a HTTP/1 serialization of it, generalized from current HTTP headers.},
}