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Nifi: what`s the difference between InvokeHTTP and RestLookupService?

Explorer

Hi! I face to the problem with my flow enrichment. For example, I have a flow with city name, and I want to get all stores and it metrics using API request (

http://example.com/service/${city}/). Previously I done it via InvokeHTTP. But I know that RestLookupService exists. I done the similar to the InvokeHTTP steps in it and got a warning: 'User-Defined-Properties' is invalid because At least one user-defined-property must be specified.

Probably, I don`t understand it`s usage right.