switch to 421 error code for invalid authority

Author: thestinger

nginx/nginx.conf

@@ -110,7 +110,7 @@ http {
 
         # https://trac.nginx.org/nginx/ticket/2012
         location / {
-            return 404;
+            return 421;
         }
     }
 
@@ -136,7 +136,7 @@ http {
 
         # https://trac.nginx.org/nginx/ticket/2012
         location / {
-            return 404;
+            return 421;
         }
     }