Windows support broken due to gunicorn

[BYK]

#36 switched to Gunicorn which is not supported on Windows. So as of 1.4.0, functions-framework is not usable on Windows.

[di]

@BYK, sorry for the trouble. Can you share exactly what error you're getting?

For now, you should be able to work around this with the --debug flag, which uses Flask's built-in HTTP server instead.

[BYK]

For now, you should be able to work around this with the --debug flag, which uses Flask's built-in HTTP server instead.

I think that may need to be the default or needs to be advertised for local development scenarios.

That being said, I cannot even run --help as it imports gunicorn by default, which tries to import fcntl and fails there :)

[BYK]

Full error and stack trace:

$ functions-framework --help
Traceback (most recent call last):
  File "C:\<redacted>\Python38\lib\runpy.py", line 193, in _run_module_as
_main
    return _run_code(code, main_globals, None,
  File "C:\<redacted>\Python38\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\<redacted>\Scripts\functions-framework.exe\__main__.py", line
4, in <module>
  File "c:\<redacted>\lib\site-packages\functions_framework\_cli.py", lin
e 20, in <module>
    from functions_framework._http import create_server
  File "c:\<redacted>\lib\site-packages\functions_framework\_http.py", li
ne 15, in <module>
    import gunicorn.app.base
  File "c:\<redacted>\lib\site-packages\gunicorn\app\base.py", line 11, i
n <module>
    from gunicorn import util
  File "c:\<redacted>\lib\site-packages\gunicorn\util.py", line 9, in <mo
dule>
    import fcntl
ModuleNotFoundError: No module named 'fcntl'

[di]

Got it, sorry about that. In that case, you can pin to functions-framework==1.3.0 for now.

[BYK]

@di yup, that's what I did. Thanks! :)

[di]

Fixed in functions-framework==1.4.1.