WebSocket 1003 Unsupported Data vs 1006 Abnormal Closure
Both WebSocket 1003 (Unsupported Data) and 1006 (Abnormal Closure) belong to the WebSocket Close Codes category. 1003 indicates that an endpoint received a type of data it cannot accept. For example, a text-only endpoint received a binary message, or vice versa. Meanwhile, 1006 means that a reserved value indicating the connection was closed abnormally without a Close frame being sent. This code must not be set by an endpoint.
الوصف
An endpoint received a type of data it cannot accept. For example, a text-only endpoint received a binary message, or vice versa.
متى تراه
The client sent a binary frame to a server that only handles text, or a text frame to a binary-only endpoint. The receiver does not know how to process this data type.
كيفية الإصلاح
Verify the message type (text vs binary) matches what the server expects. Update your client to send the correct opcode for the data format.
الوصف
A reserved value indicating the connection was closed abnormally without a Close frame being sent. This code must not be set by an endpoint.
متى تراه
The TCP connection dropped unexpectedly — the server crashed, the network cable was unplugged, or a firewall killed the idle connection. No proper WebSocket Close handshake occurred.
كيفية الإصلاح
Implement reconnection with exponential backoff. Use WebSocket ping/pong frames to detect dead connections early. Check for network-level timeouts or aggressive load balancer idle limits.
الفروق الرئيسية
WebSocket 1003: An endpoint received a type of data it cannot accept. For example, a text-only endpoint received a binary message, or vice versa.
WebSocket 1006: A reserved value indicating the connection was closed abnormally without a Close frame being sent. This code must not be set by an endpoint.
You encounter 1003 when the client sent a binary frame to a server that only handles text, or a text frame to a binary-only endpoint. The receiver does not know how to process this data type.
You encounter 1006 when the TCP connection dropped unexpectedly — the server crashed, the network cable was unplugged, or a firewall killed the idle connection. No proper WebSocket Close handshake occurred.
متى تستخدم أيًا منهما
For 1003 (Unsupported Data): Verify the message type (text vs binary) matches what the server expects. Update your client to send the correct opcode for the data format. For 1006 (Abnormal Closure): Implement reconnection with exponential backoff. Use WebSocket ping/pong frames to detect dead connections early. Check for network-level timeouts or aggressive load balancer idle limits.