WebContentNotFound on refreshing page of SPA deployed as Azure Blob Static Website with CDN

You can simply configure the error page to index.html in your static website:

Actually the issue was I didn't have 404.html defined -- the blob storage for SPA doesn't understand what file to serve for any other routes than the root one. So every other route will go to the 404 file. But in a SPA even the 404 goes through the index file. So all I did is mention index.html as my 404 file and all is well.

For me adding the index.html page as the Error document page did not help when navigating by url as it would still reload the app. I posted an answer elsewhere relating to rather using the Angular HashLocationStrategy and that does not cause a page reload when changing the URL manually.

Answer on other SO question