hi everyone , We want to put data in web app using API endpoint  https://localhost:8000/api/event/${id}/attributes this is the API endpoint that i have used in invoke HTTP processor in Remote URL field with PUT method.  we want to create new attribute with value and this attribute is a dictionary type so we have to pass the data in the dictionary format for this we have used updateattribute processor and attributetojson processor.  updateAttribute processor snap Attributetojson processor snap and the below is out of attributetoJson processor (flowfile) {"note":"note from nifi","attributes":"{\n \"workflow\":\"process\"\n }","id":"1ecfbcbb-38bf-49e9-a77e-a88w"}   the error msg in invoke http processor  { "code": 500, "errors": [ "Traceback (most recent call last):\n File \"/usr/local/lib/python3.6/site-packages/flask/app.py\", line 1949, in full_dispatch_request\n rv = self.dispatch_request()\n File \"/usr/local/lib/python3.6/site-packages/ No value set   as per my knowledge this is type error. I think the Dictionary is not sending in correct format . i have also used ${attributes:unescapeJson()} in updateAttribute ...but i think i have made a mistake in the declaration property_name property_value attributes {"workflow": "process"} 'attributes'  ${attributes:unescapeJson()}    thanks    ... View more

We want to configure listenhttp processor that listen our web service. question is what are the configuration in http listener processor in nifi such that when we will make curl post request this ListenHttp processor will catch the update. basically i didn't understand what i have to put in Base path (is it i have to put nifi address i.e  http://localhost:8080/contentListener  or our web app service URL???) what is contentListener. And is it i have to put our web app port number in listening port? in the request command what i have to put in url part   curl --request POST 'http://(here i have to used the nifi url)' -H 'Authorization: Key demo-key   i know this is very basic question but i'm just using this don't know any thing about nifi and curl command .....thanks in advance ... View more