diff --git a/NewLife.Core/Net/WebSocketClient.cs b/NewLife.Core/Net/WebSocketClient.cs
index c62b7d6..8d95289 100644
--- a/NewLife.Core/Net/WebSocketClient.cs
+++ b/NewLife.Core/Net/WebSocketClient.cs
@@ -1,5 +1,4 @@
using System.Net;
-using System.Net.Http.Headers;
using System.Security.Cryptography;
using NewLife.Data;
using NewLife.Http;