diff --git a/templates/etc/nginx/nginx.conf.j2 b/templates/etc/nginx/nginx.conf.j2
index 6f8082f..706c525 100644
--- a/templates/etc/nginx/nginx.conf.j2
+++ b/templates/etc/nginx/nginx.conf.j2
@@ -28,6 +28,11 @@ http {
   access_log off;
   {% endif %}
 
+  map $http_upgrade $connection_upgrade {
+    default upgrade;
+    ''      close;
+  }
+
   sendfile            on;
   tcp_nopush          on;
   tcp_nodelay         on;