Deploy Flask on Azure using Kudu - shows only default page

Question

I built and deployed Flask app in Python to Azure. I tested the app locally and everything works. I am using Kudu for deployment on Windows and Python 3.6.

However, once the app is successfully deployed, all I can see is the default page:

This website is running Python 3.6.6

From what i saw, the fault is on the Kudu web.config file, which looks like this:

<configuration>
  <appSettings>
    <add key="pythonpath" value="%SystemDrive%\home\site\wwwroot" />
    <add key="WSGI_HANDLER" value="hostingstart-python.application" />
  </appSettings>
</configuration>

For some reason, it points to the hostingstart-python.application (has .html and .py files) which indeed shows the default page.

My /wwwroot folder looks as follows:

env
templates
.gitignore
app.py
config.py
file_manager.py
hostingstart-python.html
hostingstart-python.py
README.md
requirements.txt
web.config

I tried various versions of the web.config file, such as the one below, but without any luck. For WSGI_HANDLER I put name of the web app, but perhaps another name has to be there?

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>
    <add key="WSGI_HANDLER" value="UploadToolApp.app"/>
    <add key="PYTHONPATH" value="D:\home\site\wwwroot"/>
    <add key="WSGI_LOG" value="D:\home\LogFiles\wfastcgi.log"/>
  </appSettings>
  <system.webServer>
    <handlers>
      <add name="PythonHandler" path="*" verb="*" modules="FastCgiModule" scriptProcessor="D:\home\Python364x64\python.exe|D:\home\Python364x64/scripts\wfastcgi.py" resourceType="Unspecified" requireAccess="Script"/>
    </handlers>
  </system.webServer>
</configuration>

Which results in:

The page cannot be displayed because an internal server error has occurred.

Answer 1

The solution was to switch to Linux machine, then everything works as it supposed to.