'Glances API RESTFul implementation.
Return the JSON representation of the Glances command line arguments item
HTTP/200 if OK
HTTP/400 if item is not found
HTTP/404 if others error'

def _api_args_item(self, item):

    response.content_type = 'application/json'
    if (item not in self.args):
        abort(400, ('Unknown    argument    item    %s' % item))
    try:
        args_json = json.dumps(vars(self.args)[item])
    except Exception as e:
        abort(404, ('Cannot    get    args    item    (%s)' % str(e)))
    return args_json
