supporting the URL that starts with '/'

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@17028 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Functions.java

@@ -962,6 +962,8 @@ public class Functions {
 
         if(SCHEME.matcher(urlName).matches())
             return urlName; // absolute URL
+        if(urlName.startsWith("/"))
+            return Stapler.getCurrentRequest().getContextPath()+urlName+'/';
         else
             // relative URL name
             return Stapler.getCurrentRequest().getContextPath()+'/'+itUrl+urlName+'/';

core/src/main/java/hudson/model/Action.java

@@ -91,6 +91,10 @@ public interface Action extends ModelObject {
      * The returned string can be an absolute URL, like "http://www.sun.com/",
      * which is useful for directly connecting to external systems.
      *
+     * <p>
+     * If the returned string starts with '/', like '/foo', then it's assumed to be
+     * relative to the context path of the Hudson webapp. 
+     *
      * @return
      *      null if this action object doesn't need to be bound to web
      *      (when you do that, be sure to also return null from {@link #getIconFileName()}.

core/src/main/java/hudson/model/Hudson.java

@@ -2025,7 +2025,7 @@ public final class Hudson extends Node implements ItemGroup<TopLevelItem>, Stapl
 
     public Object getDynamic(String token, StaplerRequest req, StaplerResponse rsp) {
         for (Action a : getActions())
-            if(a.getUrlName().equals(token))
+            if(a.getUrlName().equals(token) || a.getUrlName().equals('/'+token))
                 return a;
         for (Action a : getManagementLinks())
             if(a.getUrlName().equals(token))