WebSocket 1000 Normal Closure vs 1012 Service Restart
Both WebSocket 1000 (Normal Closure) and 1012 (Service Restart) belong to the WebSocket Close Codes category. 1000 indicates that the connection has been closed cleanly, meaning the purpose for which it was established has been fulfilled. Both endpoints agree the session is complete. Meanwhile, 1012 means that the server is terminating the connection because it is restarting. The client should reconnect after a brief delay.
Описание
The connection has been closed cleanly, meaning the purpose for which it was established has been fulfilled. Both endpoints agree the session is complete.
Когда вы это видите
The WebSocket connection closed gracefully after both sides finished exchanging data. This is the expected close code for a successful session.
Как исправить
No fix needed — this indicates everything worked as intended. If you did not expect the connection to close, check your application logic for premature close() calls.
Описание
The server is terminating the connection because it is restarting. The client should reconnect after a brief delay.
Когда вы это видите
The server is performing a planned restart — for example, during a deployment or configuration reload. The connection will be available again shortly.
Как исправить
Implement automatic reconnection with a short delay (1-5 seconds). This code signals that reconnecting is expected and should succeed once the server is back up.
Ключевые различия
WebSocket 1000: The connection has been closed cleanly, meaning the purpose for which it was established has been fulfilled. Both endpoints agree the session is complete.
WebSocket 1012: The server is terminating the connection because it is restarting. The client should reconnect after a brief delay.
You encounter 1000 when the WebSocket connection closed gracefully after both sides finished exchanging data. This is the expected close code for a successful session.
You encounter 1012 when the server is performing a planned restart — for example, during a deployment or configuration reload. The connection will be available again shortly.
Когда что использовать
For 1000 (Normal Closure): No fix needed — this indicates everything worked as intended. If you did not expect the connection to close, check your application logic for premature close() calls. For 1012 (Service Restart): Implement automatic reconnection with a short delay (1-5 seconds). This code signals that reconnecting is expected and should succeed once the server is back up.