merge fix from dotnet#97320

Author: pavelsavara

src/mono/wasm/runtime/web-socket.ts

@@ -135,6 +135,12 @@ export function ws_wasm_send(ws: WebSocketExtension, buffer_ptr: VoidPtr, buffer
         return Promise.reject(new Error("InvalidState: The WebSocket is not connected."));
     }
 
+    if (ws.readyState === WebSocket.CLOSED) {
+        // this is server initiated close but not partial close
+        // because CloseOutputAsync_ServerInitiated_CanSend expectations, we don't fail here
+        return null;
+    }
+
     const buffer_view = new Uint8Array(localHeapViewU8().buffer, <any>buffer_ptr, buffer_length);
     const whole_buffer = _mono_wasm_web_socket_send_buffering(ws, buffer_view, message_type, end_of_message);