Responds to a GET request to /because/[userID]/[itemID](?howMany=n)(&offset=o) . Results are items that the user has interacted with that best explain why a given item was recommended. Outputs contain item and score pairs, where the score is an opaque value where higher values mean more relevant to recommendation. If the user is not known to the model, a javax.ws.rs.core.Response.Status#NOT_FOUND response is generated.If the user has no known items associated, the response has no elements. howMany and offset behavior, and output, are as in Recommend .