--- loncom/interface/londocs.pm	2018/07/04 13:55:27	1.656
+++ loncom/interface/londocs.pm	2018/12/27 20:10:31	1.657
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Documents
 #
-# $Id: londocs.pm,v 1.656 2018/07/04 13:55:27 raeburn Exp $
+# $Id: londocs.pm,v 1.657 2018/12/27 20:10:31 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -4171,7 +4171,9 @@ END
             } elsif ($url eq "/public/$coursedom/$coursenum/syllabus") {
                 if (($ENV{'SERVER_PORT'} == 443) &&
                     ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
-                    $url .= '?usehttp=1';
+                    unless (&Apache::lonnet::uses_sts()) {
+                        $url .= '?usehttp=1';
+                    }
                     $nomodal = 1;
                 }
             }
@@ -4237,8 +4239,11 @@ END
                 $url = $1;
                 $anchor = $2;
                 if (($url =~ m{^(|/adm/wrapper)/ext/(?!https:)}) && ($ENV{'SERVER_PORT'} == 443)) {
-                    if ($hostname ne '') {
-                        $url = 'http://'.$hostname.$url;
+                    unless (&Apache::lonnet::uses_sts()) {
+                        if ($hostname ne '') {
+                            $url = 'http://'.$hostname.$url;
+                        }
+                        $url .= (($url =~ /\?/) ? '&':'?').'usehttp=1';
                     }
                     $nomodal = 1;
                 }
@@ -4246,10 +4251,12 @@ END
         } elsif ($url =~ m{^\Q/public/$coursedom/$coursenum/syllabus\E}) {
             if (($ENV{'SERVER_PORT'} == 443) &&
                 ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
-                if ($hostname ne '') {
-                    $url = 'http://'.$hostname.$url;
+                unless (&Apache::lonnet::uses_sts()) {
+                    if ($hostname ne '') {
+                        $url = 'http://'.$hostname.$url;
+                    }
+                    $url .= (($url =~ /\?/) ? '&':'?').'usehttp=1';
                 }
-                $url .= (($url =~ /\?/) ? '&':'?').'usehttp=1';
                 $nomodal = 1;
             }
         }
@@ -7272,14 +7279,18 @@ sub editing_js {
                 if ($backtourl =~ m{^\Q/public/$coursedom/$coursenum/syllabus\E}) {
                     if (($ENV{'SERVER_PORT'} == 443) &&
                         ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
-                        if ($hostname ne '') {
-                            $backtourl = 'http://'.$hostname.$backtourl;
+                        unless (&Apache::lonnet::uses_sts()) {
+                            if ($hostname ne '') {
+                                $backtourl = 'http://'.$hostname.$backtourl;
+                            }
+                            $backtourl .= (($backtourl =~ /\?/) ? '&':'?').'usehttp=1';
                         }
-                        $backtourl .= (($backtourl =~ /\?/) ? '&':'?').'usehttp=1';
                     }
                 } elsif ($backtourl =~ m{^/adm/wrapper/ext/(?!https:)}) {
                     if (($ENV{'SERVER_PORT'} == 443) && ($hostname ne '')) {
-                        $backtourl = 'http://'.$hostname.$backtourl;
+                        unless (&Apache::lonnet::uses_sts()) {
+                            $backtourl = 'http://'.$hostname.$backtourl;
+                        }
                     }
                 }
                 if ($anchor ne '') {