class KramdownRFC::KDRFC

def run_idnits_remotely(txt_fn)
  url = URI(IDNITS_WEBSERVICE)
  req = Net::HTTP::Post.new(url)
  form = [["file", File.open(txt_fn),
           {filename: "input.txt",
            content_type: "text/plain"}],
          ["hidetext", "true"]]
  diag = ["url/form: ", url, form].inspect
  req.set_form(form, 'multipart/form-data')
  warn "* requesting idnits at #{url}" if @options.verbose
  t0 = Time.now
  res = persistent_http.request(url, req)
  warn "* elapsed time: #{Time.now - t0}" if @options.verbose
  case res
  when Net::HTTPBadRequest
    result = checked_json(res.body)
    raise IOError.new("*** Remote Error: #{result["error"]}")
  when Net::HTTPOK
    case res.content_type
    when 'text/plain'
      if res.body == ''
        raise IOError.new("*** HTTP response is empty with status #{res.code}, not written")
      end
      puts res.body
    else
      warning = "*** HTTP response has unexpected content_type #{res.content_type} with status #{res.code}, #{diag}"
      warning << "\n"
      warning << res.body
      raise IOError.new(warning)
    end
  else
    raise IOError.new("*** HTTP response: #{res.code}, #{diag}")
  end
end