###
4.5.5.2 Filter Members

`closed`
  A boolean value indicating whether a filter is closed. (Read-Only)

`name`
  String. The name under which this filter is registered. (Read-Only)

`req`
  A reference to the request object. (Read-Only)

`is_input`
  Boolean. True if this is an input filter. (Read-Only)

`handler`
  String. The name of the Python handler for this filter as specified in the configuration. (Read-Only)