One more improvement for GRAILS-9611 Fix

Author: lhotari

grails-web/src/main/groovy/org/codehaus/groovy/grails/web/mapping/CachingLinkGenerator.java

@@ -149,7 +149,7 @@ public String resource(Map attrs) {
     protected String makeKey(String prefix, Map attrs) {
         StringBuilder sb=new StringBuilder();
         sb.append(prefix);
-        if(isAbsolute(attrs)) {
+        if(getConfiguredServerBaseURL()==null && isAbsolute(attrs)) {
             GrailsWebRequest webRequest = GrailsWebRequest.lookup();
             if(webRequest != null) {
                 sb.append(webRequest.getBaseUrl());