diff --git a/docs/u_e-80_to_443.md b/docs/u_e-80_to_443.md
index eaafd06e3..514a45cdc 100644
--- a/docs/u_e-80_to_443.md
+++ b/docs/u_e-80_to_443.md
@@ -26,6 +26,7 @@ server {
   listen 80 default_server;
   listen [::]:80 default_server;
   include /etc/nginx/conf.d/server_name.active;
+  if ( $request_uri ~* "%0A|%0D" ) { return 403; }
   return 301 https://$host$uri$is_args$args;
 }
 ```