%% You should probably cite rfc9440 instead of this I-D.
@techreport{ietf-httpbis-client-cert-field-06,
    number =    {draft-ietf-httpbis-client-cert-field-06},
    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-client-cert-field/06/},
    author =    {Brian Campbell and Mike Bishop},
    title =     {{Client-Cert HTTP Header Field}},
    pagetotal = 14,
    year =      2023,
    month =     mar,
    day =       17,
    abstract =  {This document describes HTTP extension header fields that allow a TLS terminating reverse proxy (TTRP) to convey the client certificate information of a mutually authenticated TLS connection to the origin server in a common and predictable manner.},
}