* @param array[] $calls For each array, call addVaryHeader() with those arguments
* @param string[] $cookies Array of cookie names to vary on
* @param string $vary Text of expected Vary header (including the 'Vary: ')
* @param array[] $calls For each array, call addVaryHeader() with those arguments
* @param string[] $cookies Array of cookie names to vary on
* @param string $vary Text of expected Vary header (including the 'Vary: ')