Merge pull request #251 from zowe/bugfix/v2/nodev14

Fix older v14 support

bin/app-server.sh

@@ -91,11 +91,18 @@ else
   ZLUX_SERVER_FILE=zluxServer.js
 fi
 
+# Tells node whether to prefer ipv4 or ipv6 results to DNS lookups
 ZLUX_DNS_ORDER="--dns-result-order=ipv4first"
 if [ "$ZWE_components_app_server_dns_lookupOrder" = "ipv6" ]; then
   ZLUX_DNS_ORDER="--dns-result-order=verbatim"
 fi
 
+# not all versions of node support the above (14.18+ generally) so we can just try it to see what happens.
+v4_check=$(${NODE_BIN} ${ZLUX_DNS_ORDER} -e "console.log('success');")
+if [ "${v4_check}" != "success" ]; then
+  ZLUX_DNS_ORDER=
+fi
+
 if [ -z "$ZLUX_NO_LOGFILE" ]; then
     __UNTAGGED_READ_MODE=V6 \
     _BPX_JOBNAME=${ZOWE_PREFIX}DS \