%% You should probably cite rfc7541 instead of this I-D.
@techreport{ietf-httpbis-header-compression-02,
    number =    {draft-ietf-httpbis-header-compression-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-httpbis-header-compression/02/},
    author =    {Roberto Peon and Herve Ruellan},
    title =     {{HPACK}},
    pagetotal = 22,
    year =      2013,
    month =     aug,
    day =       21,
    abstract =  {This document describes HPACK, a format adapted to efficiently represent HTTP headers in the context of HTTP/2.0.},
}