code: public void setOverrideForward( InterceptorForward fwd, ActionInterceptor interceptor )
      {
          setResultOverride( fwd, interceptor );
  
          //
          // If there was no original forward (i.e., this is happening before the action was invoked), create a
          // pseudo-forward out of the original request.
          //
          if ( _originalForward == null ) _originalForward = new OriginalForward( getRequest() );
  
          //
          // Store this context in the request.
          //
          getRequest().setAttribute( ACTIVE_INTERCEPTOR_CONTEXT_ATTR, this );
      }
docs: Set an {@link InterceptorForward} that changes the destination URI of the intercepted action.  If the
  InterceptorForward points to a nested page flow, then {@link ActionInterceptor#afterNestedIntercept} will be
  called before the nested page flow returns to the original page flow.