%% You should probably cite draft-divilly-user-defined-resource-error instead of this I-D.
@techreport{divilly-status-555-00,
    number =    {draft-divilly-status-555-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-divilly-status-555/00/},
    author =    {Colm Divilly},
    title =     {{User Defined Resource Error HTTP Status Code}},
    pagetotal = 5,
    year =      2020,
    month =     mar,
    day =       20,
    abstract =  {This document specifies an additional HyperText Transfer Protocol (HTTP) status code to indicate server error conditions arising during evaluation of user defined resources hosted by the server. Conventions and Terminology},
}