--- rat/lonpageflip.pm	2018/11/13 03:59:17	1.98
+++ rat/lonpageflip.pm	2018/12/27 20:11:16	1.99
@@ -2,7 +2,7 @@
 #
 # Page flip handler
 #
-# $Id: lonpageflip.pm,v 1.98 2018/11/13 03:59:17 raeburn Exp $
+# $Id: lonpageflip.pm,v 1.99 2018/12/27 20:11:16 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -313,11 +313,16 @@ sub check_http_req {
         if (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
             ($ENV{'SERVER_PORT'} == 443) &&
             ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
-            $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
-            $usehttp = 1;
+            unless (&Apache::lonnet::uses_sts()) {
+                $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
+                $usehttp = 1;
+            }
         } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
                  ($ENV{'SERVER_PORT'} == 443)) {
-            $usehttp = 1;
+            unless (&Apache::lonnet::uses_sts()) {
+                $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
+                $usehttp = 1;
+            }
         }
     }
     return $usehttp;