Add a text/non-file field to parse for a value in the request

def add_field(self, name, default=None, required=False, error=None):
        """ Add a text/non-file field to parse for a value in the request """
        if name is None:
            return
        self.field_arguments.append(dict(
            name=name,
            default=default,
            required=required,
            error=error))