%% You should probably cite rfc8187 instead of this I-D.
@techreport{ietf-httpbis-rfc5987bis-05,
    number =    {draft-ietf-httpbis-rfc5987bis-05},
    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-rfc5987bis/05/},
    author =    {Julian Reschke},
    title =     {{Indicating Character Encoding and Language for HTTP Header Field Parameters}},
    pagetotal = 13,
    year =      2017,
    month =     feb,
    day =       20,
    abstract =  {By default, header field values in Hypertext Transfer Protocol (HTTP) messages cannot easily carry characters outside the US-ASCII coded character set. RFC 2231 defines an encoding mechanism for use in parameters inside Multipurpose Internet Mail Extensions (MIME) header field values. This document specifies an encoding suitable for use in HTTP header fields that is compatible with a simplified profile of the encoding defined in RFC 2231. This document obsoletes RFC 5987.},
}