diff --git a/src/main/java/com/loafle/overflow/container/client/handler/RPCClientHandler.java b/src/main/java/com/loafle/overflow/container/client/handler/RPCClientHandler.java
index 0c36d6d..30b24ff 100644
--- a/src/main/java/com/loafle/overflow/container/client/handler/RPCClientHandler.java
+++ b/src/main/java/com/loafle/overflow/container/client/handler/RPCClientHandler.java
@@ -65,7 +65,7 @@ public class RPCClientHandler extends SimpleChannelInboundHandler<WebSocketFrame
     }
     try {
       byte[] requestBytes = this.clientCodec.request(method, params, null);
-      this.ctx.channel().writeAndFlush(requestBytes);
+      this.ctx.channel().writeAndFlush(new TextWebSocketFrame(new String(requestBytes)));
     } catch (RPCException e) {
       logger.error("cannot create notification", e);
     }