How to deploy Flask app as a windows service over HTTPS?

Question

Using Flask API and WSGIServer, I'm able to launch it over HTTPS. But, I want our API as a windows service. So, when I run windows service and hit "https://127.0.0.1:88", I'm getting "Error: Client network socket disconnected before secure TLS connection was established". Any advice on how to fix or debug.

See code snippets below.

import sys
import servicemanager
import win32serviceutil
from gevent import pywsgi

#Flask App
from myapp import app


class Service(win32serviceutil.ServiceFramework):
    _svc_name_ = "MyService"
    _svc_display_name_ = "MyServer"
    _svc_description_ = "MyAPI"

    def __init__(self, *args):
        super().__init__(*args)

        self.http_server = pywsgi.WSGIServer(('127.0.0.1', 88), app, keyfile='privateKey.key', certfile='certificate.crt')

        self.SvcStop = self.http_server.stop
        self.SvcDoRun = self.http_server.serve_forever

if __name__ == '__main__':
    
    if len(sys.argv) == 1:
        servicemanager.Initialize()
        servicemanager.PrepareToHostSingle(Service)
        servicemanager.StartServiceCtrlDispatcher()
    else:
        win32serviceutil.HandleCommandLine(Service)