%% You should probably cite draft-ietf-tls-esni instead of this I-D.
@techreport{rescorla-tls-esni-00,
    number =    {draft-rescorla-tls-esni-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-rescorla-tls-esni/00/},
    author =    {Eric Rescorla and Kazuho Oku and Nick Sullivan and Christopher A. Wood},
    title =     {{Encrypted Server Name Indication for TLS 1.3}},
    pagetotal = 19,
    year =      2018,
    month =     jul,
    day =       2,
    abstract =  {This document defines a simple mechanism for encrypting the Server Name Indication for TLS 1.3.},
}