vdv7

Extended Log File Format (ELF), version 1.1.
  ELF version 1.0 is specified here: https://www.w3.org/TR/WD-logfile.html
  In addition to ELF 1.0 fields, 1.1 allows the following fields:
    Field names that require no prefix:
      epochs, epochms,        seconds and milliseconds since epoch
    Field names that require sc-, cs-, s-, or c- prefix:
      port,                   server port
      protocol                connection protocol (e.g. http, https, ws)
      raw, raw,               all data coming over the wire, including headers
      head, head,             entire string of headers