There are a number of things you need to watch out for when connecting to APIs secured with Azure AD from SharePoint Framework solutions.
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If you host your APIs on Azure, secure them with Azure AD and want to use them in the SharePoint Framework, you need to setup CORS correctly.
Connecting your Office solutions to LOB adds complexity and often requires server-side code. What if you could leverage Azure API Apps to connect your Single Page Applications to LOB?
Recently I wrote about the issue with issuing multiple CORS requests using the ADAL JS library. It turns out that there is even more to it.