making $.when() always report one arg

gistfile1.txt

var getName = (function() {

  var cache; // private cache

  // gets assigned to getName
  return function() {

  	// return the cache if it's valid or
  	return cache || $.ajax({
  		  	url: 'srv/echo', 
  				data: { random: 1 },
  				success: function( data ) {
  					cache = data;
  				}
  			}).pipe( function( res ) {
  			  return $.when( res );
  			});								
  };
})();