Index: head/etc/freebsd-update.conf
===================================================================
--- head/etc/freebsd-update.conf	(revision 294205)
+++ head/etc/freebsd-update.conf	(working copy)
@@ -11,6 +11,9 @@
 # performance.
 ServerName update.FreeBSD.org
 
+# HTTP_PROXY, can be overwritten with setenv on the command line 
+# HttpProxy proxy.your.domain:proxy_port
+
 # Components of the base system which should be kept updated.
 Components src world kernel
 
Index: head/usr.sbin/freebsd-update/freebsd-update.sh
===================================================================
--- head/usr.sbin/freebsd-update/freebsd-update.sh	(revision 294205)
+++ head/usr.sbin/freebsd-update/freebsd-update.sh	(working copy)
@@ -93,7 +93,8 @@
 CONFIGOPTIONS="KEYPRINT WORKDIR SERVERNAME MAILTO ALLOWADD ALLOWDELETE
     KEEPMODIFIEDMETADATA COMPONENTS IGNOREPATHS UPDATEIFUNMODIFIED
     BASEDIR VERBOSELEVEL TARGETRELEASE STRICTCOMPONENTS MERGECHANGES
-    IDSIGNOREPATHS BACKUPKERNEL BACKUPKERNELDIR BACKUPKERNELSYMBOLFILES"
+    IDSIGNOREPATHS BACKUPKERNEL BACKUPKERNELDIR BACKUPKERNELSYMBOLFILES
+    HTTPPROXY"
 
 # Set all the configuration options to "".
 nullconfig () {
@@ -269,6 +270,17 @@
 	fi
 }
 
+# Proxy, allow overwrite via setenv
+config_HttpProxy () {
+	if [ -n "${HTTP_PROXY}${http_proxy}" ]; then
+		return 0
+	elif [ -z ${HttpProxy} ]; then
+		export HTTP_PROXY=$1
+	else
+		return 1
+	fi
+}
+
 # When fetching upgrades, should we assume the user wants exactly the
 # components listed in COMPONENTS, rather than trying to guess based on
 # what's currently installed?