blog/running-flask-web-apps-on-iis-with-httpplatformhandler/

[giscus[bot]]

running-flask-web-apps-on-iis-with-httpplatformhandler/

A post about how to create a simple Flask web app and host it on IIS with HttpPlatformHandler

https://halfblood.pro/running-flask-web-apps-on-iis-with-httpplatformhandler/

[IvanSteuerberg]

My app keeps the Infinite Loading even after giving permissions

[lextm]

You can hit a lot other permission issues, so Process Monitor can be your guide. Besides, try not to use virtual environments, as they make it significantly harder to locate all places that you need to change permissions.

[diego-jd]

@lextm Hello, I'm trying your tutorial but after giving permissions it still keeps loading forever.

I tried to look what's going on with Process Monitor but there's nothing with a process name = python.exe

I'm not using virtual environments

[spamchang]

Been trying to do something similar for Streamlit; this line is doing a lot of work:

With all settings in place, I can go back to IIS Manager and create a site (I chose *:8086 as site binding) to point to C:\flask-test.

I feel like I haven't replicated your success because of something in IIS Manager. I had to install the httpPlatformHandler msi and also add the ASP.NET 4.8 + extensibility features to the IIS server role/features. I might be missing something else. When I set up a Handler Mapping > Script Map to deal with *.py extension files, I get a generic Streamlit welcome message instead of the app. When I use httpPlatformHandler, the page just loads and outputs the same welcome message in the stdoutLogFile until it times out. I don't know how you did it so easily ^^;;

[lextm]

The principles should apply, but another web framework can require extra steps that I am not aware of.

[spamchang]

I did eventually get past this specific error: IIS uses a generic system account to execute the app, and Streamlit didn't handle that well. Some manual hackery got me through. But then I ran into what I think was a websockets issue. Do you have any insight into how httpPlatformHandler would handle a websocket upgrade request?

[lextm]

I added a few links in this new section, https://halfblood.pro/running-flask-web-apps-on-iis-with-httpplatformhandler/#flask-with-socketio. Python WebSockets support requires some extra setup and you can take a look.