_webapp25.py 文件源码

def handle_exception(self, exception, debug_mode):
    """Called if this handler throws an exception during execution.

    The default behavior is to call self.error(500) and print a stack trace
    if debug_mode is True.

    Args:
      exception: the exception that was thrown
      debug_mode: True if the web application is running in debug mode
    """
    self.error(500)
    logging.exception(exception)
    if debug_mode:
      lines = ''.join(traceback.format_exception(*sys.exc_info()))
      self.response.clear()
      self.response.out.write('<pre>%s</pre>' % (cgi.escape(lines, quote=True)))