Solution of "RuntimeError: UnicodeDecodeError('utf8', "id_token verification failed: Can't parse header: \xc9\xad\xbd", 52, 53, 'invalid start byte')" https://code.google.com/p/googleappengine/issues/detail?id=10285&q=Type%3DDefect&colspec=ID%20Type%20Component%20Status%20Stars%20Summary%20Language%20Priority%20Owner%20Log&start=100

utf8_patch_for_appengine.patch

*** logservice_stub.py	2013-11-27 09:09:49.463620508 -0800
--- logservice_stub.py.new	2013-11-27 09:16:53.893843940 -0800
***************
*** 19,20 ****
--- 19,21 ----
  import atexit
+ import codecs
  import logging
***************
*** 217,219 ****
      if isinstance(message, str):
!       message = message.decode('utf-8')
      return (row_id, log_line.timestamp_usec(), log_line.level(), message)
--- 218,220 ----
      if isinstance(message, str):
!       message = codecs.decode(message, 'utf-8', 'replace')
      return (row_id, log_line.timestamp_usec(), log_line.level(), message)