Index: src/org/openstreetmap/josm/io/remotecontrol/RequestProcessor.java
===================================================================
--- src/org/openstreetmap/josm/io/remotecontrol/RequestProcessor.java	(revision 16713)
+++ src/org/openstreetmap/josm/io/remotecontrol/RequestProcessor.java	(working copy)
@@ -419,6 +419,9 @@
      */
     public static JsonObject getHandlerInfoAsJSON(String cmd) {
         RequestHandler handler;
+        if (!cmd.startsWith("/")) {
+            cmd = new StringBuilder("/").append(cmd).toString();
+        }
         try {
             Class<?> c = handlers.get(cmd);
             if (c == null) return null;