Errors in web app working with VK API

Today, 09:46:55 UTC, i stopped receiving any Callbacks from VK API server (screenshot:

VK sends requests to my server properly, but receives an unknown unhand (screenshot:

For last few months I hadn't changes the app code or any settings on the VK API server side. I tried to renew my access token, but that didn't change anything.

What could cause this and how can it be fixed?

That looks like something in the network is preventing VK from reaching PythonAnywhere. Given that it's Russian, perhaps it's because of sanctions for the Ukrainian war or Russia closing its internet down.

:( I hope it is just a temporary issue...

it works now by the way

Thanks for letting us know!