add close method to DashWebsocket

Author: T4rk1n

dash/backends/_fastapi.py

@@ -152,6 +152,15 @@ async def get_prop(self, component_id: str, prop_name: str) -> Any:
                 f"Timeout waiting for get_prop response for {component_id}.{prop_name}"
             ) from exc
 
+    async def close(self, code: int = 1000, reason: str = "Connection closed") -> None:
+        """Close the WebSocket connection.
+
+        Args:
+            code: WebSocket close code (default 1000 for normal closure)
+            reason: Human-readable reason for closing
+        """
+        await self._websocket.close(code=code, reason=reason)
+
 
 _current_request_var = ContextVar("dash_current_request", default=None)
 

dash/backends/base_server.py

@@ -412,3 +412,15 @@ async def set_prop(self, component_id: str, prop_name: str, value: Any) -> None:
             prop_name: The property name to update
             value: The new value to set
         """
+
+    @abstractmethod
+    async def close(self, code: int = 1000, reason: str = "Connection closed") -> None:
+        """Close the WebSocket connection.
+
+        Allows developers to forcibly disconnect a client, e.g., on suspicious
+        activity, session revocation, or policy violation.
+
+        Args:
+            code: WebSocket close code (default 1000 for normal closure)
+            reason: Human-readable reason for closing
+        """