I'm issuing the following URL by using a GetHTTP processor named "States", whose URL property - ${DOMAIN} is omitted for issues of brevity - is http://${DOMAIN}/api/states which gives me the following results [ { id: 1, name: "Alabama" }, { id: 2, name: "California" } ... ] Then I split the array by using a SplitJson processor "Split by state", whose JsonPathExpression property is $.* so that I can fetch each object of the array shown above. Next, I use a AttributesToJSON to map the property id to a state flowfile-attribute, as below Destination - flowfile-attribute state - $.id Now, for each spplited JSON object, I want to issue a new GET HTTP called "Municipalities by state" in the form of http://${DOMAIN}/api/states/${state}/municipalities. However, NiFi doesn't allow me "connect" the AttibutesToJson to an GetHttp processor. So What should I do to enable the GetHttp processor "Municipalities by state" ? ... View more