class KramdownRFC::KDRFC

def process_xml_remotely(input, output, *flags)

  format = flags[0] || "--text"
  warn "* converting remotely from xml #{input} to #{format} #{output}" if @options.verbose
  maf = MODE_AS_FORMAT[format]
  unless maf
    raise ArgumentError.new("*** don't know how to convert remotely from xml #{input} to #{format} #{output}")
  end
  url = URI(XML2RFC_WEBSERVICE + maf)
  req = Net::HTTP::Post.new(url)
  form = [["file", File.open(input),
           {filename: "input.xml",
            content_type: "text/plain"}]]
  diag = ["url/form: ", url, form].inspect
  req.set_form(form, 'multipart/form-data')
  warn "* requesting 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 'application/json'
      if res.body == ''
        raise IOError.new("*** HTTP response is empty with status #{res.code}, not written")
      end
      # warn "* res.body #{res.body}" if @options.verbose
      result = checked_json(res.body)
      if logs = result["logs"]
        if errors = logs["errors"]
          errors.each do |err|
            warn("*** Error: #{err}")
          end
        end
        if warnings = logs["warnings"]
          warnings.each do |w|
            warn("** Warning: #{w}")
          end
        end
      end
      raise IOError.new("*** No useful result from remote") unless result["url"]
      res = persistent_http.request(URI(result["url"]))
      warn "* result content type #{res.content_type}" if @options.verbose
      if res.body == ''
        raise IOError.new("*** Second HTTP response is empty with status #{res.code}, not written")
      end
      File.open(output, "w") do |fo|
        fo.print(res.body)
      end
      warn "* #{output} written" if @options.verbose
    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