WebSocket 1002 Protocol Error vs 1012 Service Restart
Both WebSocket 1002 (Protocol Error) and 1012 (Service Restart) belong to the WebSocket Close Codes category. 1002 indicates that an endpoint is terminating the connection because it received data that violates the WebSocket protocol specification. Meanwhile, 1012 means that the server is terminating the connection because it is restarting. The client should reconnect after a brief delay.
説明
An endpoint is terminating the connection because it received data that violates the WebSocket protocol specification.
このコードが表示される場合
The WebSocket frame format is invalid — a malformed header, incorrect masking, or a reserved opcode was used. This usually indicates a broken client or proxy.
解決方法
Check that both client and server strictly follow RFC 6455 framing rules. Inspect intermediary proxies that may be corrupting WebSocket frames.
説明
The server is terminating the connection because it is restarting. The client should reconnect after a brief delay.
このコードが表示される場合
The server is performing a planned restart — for example, during a deployment or configuration reload. The connection will be available again shortly.
解決方法
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.
主な違い
WebSocket 1002: An endpoint is terminating the connection because it received data that violates the WebSocket protocol specification.
WebSocket 1012: The server is terminating the connection because it is restarting. The client should reconnect after a brief delay.
You encounter 1002 when the WebSocket frame format is invalid — a malformed header, incorrect masking, or a reserved opcode was used. This usually indicates a broken client or proxy.
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.
どちらをいつ使うか
For 1002 (Protocol Error): Check that both client and server strictly follow RFC 6455 framing rules. Inspect intermediary proxies that may be corrupting WebSocket frames. 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.