diff --git a/demo/web/app.py b/demo/web/app.py
index 887d62b..e0af798 100644
--- a/demo/web/app.py
+++ b/demo/web/app.py
@@ -363,11 +363,22 @@ def streaming_tts(text: str, **kwargs) -> Iterator[np.ndarray]:
 @app.websocket("/stream")
 async def websocket_stream(ws: WebSocket) -> None:
     await ws.accept()
-    text = ws.query_params.get("text", "")
-    print(f"Client connected, text={text!r}")
-    cfg_param = ws.query_params.get("cfg")
-    steps_param = ws.query_params.get("steps")
-    voice_param = ws.query_params.get("voice")
+
+    # Receive initial configuration message from client
+    try:
+        config_message = await ws.receive_text()
+        config = json.loads(config_message)
+    except Exception as e:
+        print(f"Error receiving config: {e}")
+        await ws.close(code=1003, reason="Invalid configuration")
+        return
+
+    text = config.get("text", "")
+    cfg_param = config.get("cfg")
+    steps_param = config.get("steps")
+    voice_param = config.get("voice")
+
+    print(f"Client connected, text length={len(text)}, cfg={cfg_param}, steps={steps_param}, voice={voice_param}")
 
     try:
         cfg_scale = float(cfg_param) if cfg_param is not None else 1.5
diff --git a/demo/web/index.html b/demo/web/index.html
index daf9df8..5adc0f9 100644
--- a/demo/web/index.html
+++ b/demo/web/index.html
@@ -918,22 +918,30 @@ <h1>VibeVoice-Realtime TTS Demo</h1>
     updateButtonLabel();
     createAudioChain();
 
-    const params = new URLSearchParams();
-    params.set('text', textValue);
+    // Prepare configuration object to send via WebSocket message instead of URL
+    const config = {
+      text: textValue,
+    };
     if (!Number.isNaN(cfgValue)) {
-      params.set('cfg', cfgValue.toFixed(3));
+      config.cfg = cfgValue.toFixed(3);
     }
     if (!Number.isNaN(stepsValue)) {
-      params.set('steps', stepsValue.toString());
+      config.steps = stepsValue.toString();
     }
     if (voiceValue) {
-      params.set('voice', voiceValue);
+      config.voice = voiceValue;
     }
-    const wsUrl = `${location.origin.replace(/^http/, 'ws')}/stream?${params.toString()}`;
+
+    const wsUrl = `${location.origin.replace(/^http/, 'ws')}/stream`;
 
     socket = new WebSocket(wsUrl);
     socket.binaryType = 'arraybuffer';
 
+    socket.onopen = () => {
+      // Send configuration as first message after connection opens
+      socket.send(JSON.stringify(config));
+    };
+
     socket.onmessage = event => {
       if (typeof event.data === 'string') {
         handleLogMessage(event.data);