Invoking Nifi rest api in Data Flow

@ptrsz 

Welcome to the community.

The more detail you can provide, the better the community can assist.

1. Are you trying to use the InvokeHTTP to return from the NiFi rest-api of the same NiFi instance where this NiFi sis running or accessing the rest-api of another NiFi instance?
2. Is this a NiFi cluster or standalone NiFi instance?
3. What version of Apache NiFi are you using (rest-api endpoint may differ by version)?
4. What rest-api endpoint are you trying to use?

Here is an example configuration using a secured Apache NiFi 2 instance to retrieve the NiFi system diagnostics data from the NiFi rest-api of the same Nif where the dataflow is running.

• Since NiFi is secured, the rest-api endpoint will require authentication and authorization.  The easiest way to set this up is to use a clientAuth certificate keystore for authentication.  So I setup a StandardRestrictedSSLContextService within the NiFi Process Group.
• I then configured my InvokeHTTP processor to use the above SSL Context service and configured the appropriate rest-api endpoint for the system diagnostics (https://<nifi-hostname>:<nifi-port>/nifi-api/system-diagnostics)

   

• Next I need to make sure my clientAuth certificate DN user identity has been authorized for the "view system diagnostics" within the NiFi Policies; otherwise , you will encounter a 401 not authorized response:
  

   

• Now when my invokeHTTP executes I get the json response from that rest-api endpoint with my diagnostic data:

   

   

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Thank you,
Matt