Add CORS header to redirect response

To fix usage of redirecting URL (no trailing slash) in OpenRefine

Author: fsteeg

app/controllers/HomeController.java

@@ -117,7 +117,7 @@ public static String configNested(String id, String sub) {
 	 * @return A 301 MOVED_PERMANENTLY redirect to the path
 	 */
 	public Result redirectSlash(String path) {
-		return movedPermanently("/" + path);
+		return movedPermanently("/" + path).withHeader("Access-Control-Allow-Origin", "*");
 	}
 
 	public Result index() {

conf/routes

@@ -3,7 +3,7 @@
 # ~~~~
 
 #OpenRefine reconciliation endpoint
-GET     /gnd/reconcile             controllers.Default.redirect(to = "/gnd/reconcile/")
+GET     /gnd/reconcile             controllers.HomeController.redirectSlash(path = "gnd/reconcile/")
 POST    /gnd/reconcile             controllers.Reconcile.reconcile()
 GET     /gnd/reconcile/            controllers.Reconcile.main(callback ?= "", queries ?= "", extend ?= "")
 POST    /gnd/reconcile/            controllers.Reconcile.reconcile()