@staticmethod
def get_subtype(object_dictionary):
    """
        Given the hash representation of a subtype of this class,
        use the info in the hash to return the class of the subtype.
        """
    type = object_dictionary['action']
    if type == 'EXTEND_HTTP_RESPONSE_HEADER':
        return 'ExtendHttpResponseHeaderAction'
    if type == 'ADD_HTTP_RESPONSE_HEADER':
        return 'AddHttpResponseHeaderAction'
    if type == 'REMOVE_HTTP_RESPONSE_HEADER':
        return 'RemoveHttpResponseHeaderAction'
    else:
        return 'HeaderManipulationAction'
