Index: openacs-4/packages/acs-tcl/tcl/request-processor-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/request-processor-procs.tcl,v
diff -u -r1.153.2.1 -r1.153.2.2
--- openacs-4/packages/acs-tcl/tcl/request-processor-procs.tcl	10 Mar 2019 21:34:33 -0000	1.153.2.1
+++ openacs-4/packages/acs-tcl/tcl/request-processor-procs.tcl	8 Apr 2019 13:04:15 -0000	1.153.2.2
@@ -618,9 +618,9 @@
     # ns_set get accepts a default value in 3rd argument only on
     # NaviServer; so perform the check in two steps for AOLserver
     # compatibility.
-    set upgrade_insecure_requests_p [ns_set get [ns_conn headers] Upgrade-Insecure-Requests]
-    if {$upgrade_insecure_requests_p ne "" &&
-        $upgrade_insecure_requests_p
+    set upgrade_insecure_requests_p [ns_set iget [ns_conn headers] Upgrade-Insecure-Requests]
+    if {$upgrade_insecure_requests_p ne ""
+        && $upgrade_insecure_requests_p
         && [security::https_available_p]
         && ![security::secure_conn_p]
     } {