HTTPConnectionPool error during python function execution

HTTPConnectionPool(host='localhost', port=80): Max retries exceeded with url: /v1/users/64da4dd537130292e7ad (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0xffffa86be0d0>: Failed to establish a new connection: [Errno 111] Connection refused'))

import json
from appwrite.client import Client
from appwrite.services.databases import Databases
from appwrite.services.users import Users
from appwrite.id import ID
from appwrite.services.teams import Teams


def main(req, res):
    # Environment variables
    payload = json.loads(req.variables.get('APPWRITE_FUNCTION_EVENT_DATA'))
    endpoint = req.variables.get("APPWRITE_ENDPOINT")
    project_id = req.variables.get("APPWRITE_PROJECT_ID")
    api_key = req.variables.get("APPWRITE_API_KEY")
    database_id = req.variables.get('DATABASE_ID')
    users_collection_id = req.variables.get('USERS_COLLECTION_ID')
    
    # Setup client
    client = Client()
    client.set_endpoint(endpoint).set_project(project_id).set_key(api_key)
    
    # Setup Databases
    database = Databases(client=client)
    # Setup Users
    user = Users(client=client)
    
    try:
        database.get_document(database_id, users_collection_id, payload['userId'])
    except Exception:
        try:
            user_data = json.loads(user.get(payload['userId']))
            print(user_data)
            database.create_document(
                database_id=database_id,
                collection_id=users_collection_id,
                document_id=payload['userId'],
                data={
                    'userId':payload['userId'],
                    'name':user_data['name'],
                    'email':user_data['email'],
                }
            )
        except Exception as e:
            print(str(e))