Start a processor using Python SDK of Apache Nifi

[#1]

Hi,
I have a python code which is trying to authenticates to my NIFI server and start a processor inside it.
Please see code below:

from flask import Flask

import nipyapi

import requests

app = Flask(__name__)

@app.route('/')

def home():

    nifi_url = "https://mynifiinstance:port/nifi-api/access"

    processor_id = <processorID>

    nifi_general = "https://mynifiinstance/nifi-api"

    start_processor_url = f"{nifi_general}/processors/{processor_id}/run-status"

    headers = {'Content-Type': 'application/x-www-form-urlencoded'}

    username = "username"

    password = "password"

    data = { "username": username,

            "password": password

        }

    response = requests.post(url=nifi_url, data=data,verify=False, headers=headers)

    if response.status_code == 200:

        # if successfully authenticated, then start the processor
        start_processor = requests.put(url=start_processor_url, headers=headers)

        print(start_processor.status_code)

        if start_processor.status_code == 200:

            return("Processor started successfully.")

        else:

            return(f"Starting processor failed. Status code: {start_processor.status_code}")

    else:

        return(f"Failed to start processor. Status code: {response.status_code}")

if __name__ == '__main__':

    app.run()

However, I am unable to authenticate with the given username and password. Note: that I have not made any changes in the nifi.properties file. Does it have to be changed?
Looking fwd to your responses.

[#2]

Any feedback will be appreciated. Thanks.

[#3]

@Kiranq 

The NiFi rest-api endpoint for obtaining token is not rest-api/access.
It is rest-api/access/token

https://<nifi-hostname>:<nifi-port>/nifi-api/access/token 
and data passed like:
--data-raw 'username=<username>&password=<user password>'

Then the token needs to be passed with every subsequent rest-api request.

If you found any of the suggestions/solutions provided helped you with your issue, please take a moment to login and click "Accept as Solution" on one or more of them that helped.

Thank you,
Matt