Index: openacs-4/packages/xotcl-core/tcl/bgdelivery-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/bgdelivery-procs.tcl,v
diff -u -r1.68.2.10 -r1.68.2.11
--- openacs-4/packages/xotcl-core/tcl/bgdelivery-procs.tcl	23 Jul 2019 16:56:01 -0000	1.68.2.10
+++ openacs-4/packages/xotcl-core/tcl/bgdelivery-procs.tcl	17 Apr 2020 17:28:40 -0000	1.68.2.11
@@ -29,10 +29,10 @@
 }
 #return ;# DON'T COMMIT
 
-# catch {ns_conn contentsentlength} alone does not work, since we do not have
-# a connection yet, and the bgdelivery won't be activated
-catch {ns_conn xxxxx} msg
-if {![string match "*contentsentlength*" $msg]} {
+#
+# Old style bgdelivery requires "ns_conn contentsentlength"
+#
+if {![::acs::icanuse "ns_conn contentsentlength"]} {
   ns_log notice "AOLserver is not patched for bgdelivery, NOT loading bgdelivery"
 
   ad_proc -public ad_returnfile_background {-client_data status_code mime_type filename} {