Fix for issue 455: Request dispatcher was not setting at attribute which failed to properly forward to JSPs. Thanks to Eric Burke for this fix.

git-svn-id: https://google-guice.googlecode.com/svn/trunk@1137 d779f126-a31b-0410-b53b-1d3aecad763e
diff --git a/servlet/src/com/google/inject/servlet/ManagedServletPipeline.java b/servlet/src/com/google/inject/servlet/ManagedServletPipeline.java
index 94a5ad3..650e7b1 100755
--- a/servlet/src/com/google/inject/servlet/ManagedServletPipeline.java
+++ b/servlet/src/com/google/inject/servlet/ManagedServletPipeline.java
@@ -173,8 +173,9 @@
   /**
    * A Marker constant attribute that when present in the request indicates to Guice servlet that
    * this request has been generated by a request dispatcher rather than the servlet pipeline.
+   * In accordance with section 8.4.2 of the Servlet 2.4 specification.
    */
-  public static final String REQUEST_DISPATCHER_REQUEST = "$$Guice$RDR";
+  public static final String REQUEST_DISPATCHER_REQUEST = "javax.servlet.forward.servlet_path";
 
   private static class RequestDispatcherRequestWrapper extends HttpServletRequestWrapper {
     private final String newRequestUri;