Azure WebApp Cors does not add Cors headers

Question

I have an Owin WebAPI2 .NET app that I host on an AppService in Azure.

I want to add CORS support using Azure as in this article. It seems simple, you just add an Or

Answer 1

My problem was that I accidentally put http instead of https into Azure AD B2C custom page config blade ... After change to https it works like a charm.

CORS headers missing when deployed on Azure Web App / Azure API