old_contents: from oslo_config import cfg
  
  
  wsgi_group = cfg.OptGroup('wsgi',
                            title='WSGI Options')
  
  wsgi_log_format = cfg.StrOpt(
      'wsgi_log_format',
      default='%(client_ip)s "%(request_line)s" status: %(status_code)s'
              ' len: %(body_length)s time: %(wall_seconds).7f',
      deprecated_group='DEFAULT',
      help="""
  It represents a python format string that is used as the template to generate
  log lines. The following values can be formatted into it: client_ip,
  date_time, request_line, status_code, body_length, wall_seconds.
  This option is used for building custom request loglines.
  Possible values:
   * '%(client_ip)s "%(request_line)s" status: %(status_code)s'
     'len: %(body_length)s time: %(wall_seconds).7f' (default)
   * Any formatted string formed by specific values.
  """
  )
  
  wsgi_host = cfg.IPOpt(
      'host',
      default='0.0.0.0',
      help='Address on which the self-hosting server will listen'
  )
  
  wsgi_port = cfg.PortOpt(
      'port',
      min=1,
      max=65535,
      default=8888,
      help='Port on which the self-hosting server will listen.'
  )
  
  ALL_OPTS = [
      wsgi_log_format,
      wsgi_host,
      wsgi_port,
  ]
  
  
  def register_opts(conf):
      conf.register_group(wsgi_group)
      conf.register_opts(ALL_OPTS, group=wsgi_group)
  
  
  def list_opts():
      return {wsgi_group: ALL_OPTS}
  
new_contents: from oslo_config import cfg
  
  
  wsgi_group = cfg.OptGroup('wsgi',
                            title='WSGI Options')
  
  wsgi_log_format = cfg.StrOpt(
      'wsgi_log_format',
      default='%(client_ip)s "%(request_line)s" status: %(status_code)s'
              ' len: %(body_length)s time: %(wall_seconds).7f',
      deprecated_group='DEFAULT',
      help="""
  It represents a python format string that is used as the template to generate
  log lines. The following values can be formatted into it: client_ip,
  date_time, request_line, status_code, body_length, wall_seconds.
  This option is used for building custom request loglines.
  Possible values:
   * '%(client_ip)s "%(request_line)s" status: %(status_code)s'
     'len: %(body_length)s time: %(wall_seconds).7f' (default)
   * Any formatted string formed by specific values.
  """
  )
  
  wsgi_host = cfg.IPOpt(
      'host',
      default='0.0.0.0',
      help='Address on which the self-hosting server will listen'
  )
  
  wsgi_port = cfg.PortOpt(
      'port',
      default=8888,
      help='Port on which the self-hosting server will listen.'
  )
  
  ALL_OPTS = [
      wsgi_log_format,
      wsgi_host,
      wsgi_port,
  ]
  
  
  def register_opts(conf):
      conf.register_group(wsgi_group)
      conf.register_opts(ALL_OPTS, group=wsgi_group)
  
  
  def list_opts():
      return {wsgi_group: ALL_OPTS}
  
subject: Fix error