The processor that you're using is not the ListenHTTP processor, but the HandleHttpRequest, correct?
When you use HandleHttpRequest, you must always connect that processor to a HandleHttpResponse processor so that NiFi can send a response back to the client. With this you can ingest the content of the request, process it in NiFi and send a response according to the results of your processing.
If your only requirement is to ingest the content of the HTTP request, you should use a ListenHTTP instead.
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