Api().add_resource() Don't work if running as Windows Service (win32serviceutil.ServiceFramework)

[WillianBR]

Folks,

I stumble on a weird scenario today.

I'm working on a small API Server, who will receive POST/PUT requests with service order numbers (JSON Array).

I did the home work and it work just fine while I was running as stand alone application.

But after I start the Flask app inside a Windows Service class (inherited from win32serviceutil.ServiceFramework), it fail all the time.

Any endpoint added into API() fail, but the ones added directly on Flask() app work 100% fine.

The basic block is:

app = Flask(__name__)
api = API()
...
api.add_resource(ReceiverIntNotification, '/api/<os_id>')
api.init_app(app)

But if I start it as service the call to "http://server:port/api/os999999", it's catched by Flask block:

  @app.errorhandler(404)
  def OnPageNotFound(error):

I don't wanna use the NSSM to run my service. I wanna get fine graine control over my service.

The cURL header output give me:

< HTTP/1.1 404 NOT FOUND
< Server: Werkzeug/2.1.2 Python/3.10.4
< Date: Wed, 18 May 2022 20:25:22 GMT
< Content-Type: text/html; charset=utf-8
< Content-Length: 41
< Connection: close
<

I tryed to list the endpoints (app.url_map.iter_rules()), but nothing is showed off.

By the way, Does anyone know how to list the endpoints of API()?

My pip freeze output is:

aniso8601==9.0.1
argcomplete==1.12.3
atomicwrites==1.4.0
attrs==21.4.0
bottle==0.12.18
certifi==2021.10.8
chardet==3.0.4
click==8.1.3
colorama==0.4.4
Flask==2.1.2
Flask-RESTful==0.3.9
idna==2.10
itsdangerous==2.1.2
Jinja2==3.1.2
loguru==0.6.0
MarkupSafe==2.1.1
more-itertools==8.13.0
packaging==21.3
pluggy==0.13.1
prettytable==0.7.2
py==1.11.0
PyHamcrest==2.0.2
pymongo==3.11.0
pyparsing==3.0.9
pytest==5.4.3
pytz==2022.1
pywin32==304
requests==2.24.0
servicemanager==2.0.10
six==1.16.0
urllib3==1.25.11
wcwidth==0.2.5
Werkzeug==2.1.2
win32-setctime==1.1.0

Windows Server:

Windows Server 2016, 64bits

Anything out of API() object, work just good!

Does any one stubled on this issue?

Can anyone help me?

[WillianBR]

P.S.: I digged the docs, but nothing until now!

https://flask-restful.readthedocs.io/en/latest/api.html