Server Hook to use when process running in the background

[ArijitSinghEDA]

I have the following configuration:

import global_data  # A file to store master PID

workers = 1
worker_class = "uvicorn.workers.UvicornWorker"
bind = "127.0.0.1:8111"
timeout = 86400
graceful_timeout = 86400
max_requests = 1


def when_ready(server):
    print(f"Master ID is {server.pid}")
    global_data.server_id = server.pid


def pre_request(worker, req):
    worker.log.debug("%s %s", req.method, req.path)
    print(req.method, req.path)
    if global_data.server_id is None:
        raise ValueError("Incorrect Master Process ID")
    print("Inside method !")
    print(worker)
    os.system(f"kill -TTIN {global_data.server_id}")


def post_request(worker, req, environ, resp):
    print(req.method, req.path)
    print(resp)
    print(worker)
    print(environ)


def worker_abort(worker):
    print("Worker shutdown !")

After I send a request using Postman, I get none of the print statements in the server hooks pre_request and post_request.
My objective is to initialize one worker for each request, and then kill the worker after completing the process. This is to avoid/minimise the memory leak.