PINGPing the server; returns PONG or echoes the optional message.
| 構文 | PING [message] |
| グループ | connection |
| 引数の数 | -1 |
| 導入バージョン | 1.0.0 |
| フラグ | readonly |
| 計算量 | O(1) |
| Redis 互換性 | differs: kevy has no RESP2 subscriber mode, so PING while subscribed does not switch to the array form and non-pubsub commands stay legal on a subscribed connection |