Responds to a GET request to {@code /estimate/[userID]/[itemID]} and in turn calls{@link MyrrixRecommender#estimatePreference(long,long)}.
Outputs the result of the method call as a value on one line.
This servlet can also compute several estimates at once. Send a GET request to {@code /estimate/[userID]/[itemID1](/[itemID2]/...)}. The output are estimates, in the same order as the item ID, one per line.
@author Sean Owen @since 1.0
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