is there way to control the process group though using nifi 2 api

Hi @MuruganFinastra , Are you sure you are attaching your token correctly to your requests? You should be using an Authorization header with a value of "Bearer <token>" for all requests once you fetch the token.

Thanks for your reply.

Yes, I am passing the Bearer token into the Authorisation header. Additionally, I can retrieve responses from the other APIs ({{baseUrl}}/nifi-api/flow/current-user and {{baseUrl}}/nifi-api/process-groups/{{pgId}}/status). 

So GET requests work fine for you but POSTs fail? Perhaps your user does not have write permissions?

I recommend opening devtools and looking at the Network tab to see what requests get sent when you do certain operations (starting/stopping a process group) in the UI. You should be able to replicate them with the REST API if you can do them manually in the UI.

Thanks for your suggestion. I replicated the same as UI did, but still getting the same 403- Forbidden error response.

I am not clear on what kind of example I could share with you. 403 seems to imply the user you got the token for does not have permissions to run the operation. You should verify if your user has the correct permissions, specifically "Operate the component" permissions, though I believe these are included if the user has modify permissions.

@MuruganFinastra 

Since you are getting a 403 response, the first thing you should do is see what user identity this 403 is being returned for.  For this you'll want to be tailing the nifi-user.log while you attempt to make this rest-api call. You will see the denied related log lines in the nifi-user.log.  That logging will provide the user identity string and which NiFi authorization policy required for which that user identity did not have the required permissions.   Using this output, we can determine the next steps required here. 

• Is the expected user identity being logged?
• What is the logged authorization policy resulting in the 403 response?

Also which user authentication and authorization configuration options are you using in your setup?

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Thank you,
Matt