firebase database - Does firebase3 storage url changes with time or location -

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i wondering if can save url storage in database , retrieve link every time want image? right now, calling following function each time need image , slow. afraid link might change depending on user , time?

           storage.ref(thisevent.eventimginreference).getdownloadurl().then(function (url) {                                                      //here add image url                             thisevent.eventimglink=url;                             //                             $scope.$apply();                         }).catch(function (error) {            });

download urls change if revoke download token in firebase console, it's totally fine if store them in database.


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