class HTTPClient::DigestAuth

def generate_cnonce

cf. WEBrick::HTTPAuth::DigestAuth#generate_next_nonce(aTime) 
def generate_cnonce
  now = "%012d" % Time.now.to_i
  pk = Digest::MD5.hexdigest([now, self.__id__, Process.pid, rand(65535)].join)[0, 32]
  [now + ':' + pk].pack('m*').chop
end