diff --git a/ncac/package/cac.conf b/ncac/package/cac.conf
index 0a81a26..2976450 100644
--- a/ncac/package/cac.conf
+++ b/ncac/package/cac.conf
@@ -1,6 +1,8 @@
 server {
     listen       80;
     server_name  cacserver;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection "upgrade";
 
     location / {
         root   /home/xydl/static;