Idea - implement different responses for the same request

It could be percentage wise : i.e.
items_get_10%.json, items_get_30%.json    response is chosen randomly to respect percentages named in file name

Items_get_1.json, items_get_2.json, items_get_3.json    first response tu route returns _1, then _2, then _3, then _1

I have a rest api called "getNextAction" that I would like to mock...