When a client connects to Redis, the server starts a timer to check if the connection remains active or not. If no command is received from the client within the timeout period, Redis considers the client as idle, and it closes the connection.
Redis uses a heartbeat mechanism to detect if a client has gone inactive. A PING command is sent to the client at least once every half of the timeout period. If the client fails to respond with a PONG command, Redis closes the connection.
When a client is timed out, Redis checks for any pending commands in its input buffer and discards them. Any unacknowledged commands that were sent to the client will be retried until a maximum number of attempts is reached.
In addition, Redis provides the CLIENT LIST command that can be used to get a list of currently connected clients along with their state, such as idle time and the last command executed. This allows administrators to monitor and manage clients that may have become unresponsive due to network issues or other reasons.
res.jsonValue["History"]..." />
res.jsonValue["History"];
..." />
