Azure Blob Storage CDN Asked for favicon.ico when none exists?

Question

How can favicon.ico be served to browsers making requests to a public Blob Storage Container?

For a publicly-accessible Container at blahblah.blob.core.windows.net, a CDN endpoint was created and SSL cert attached so anyone can get to blobs at https://placeiwant.somewhere/bloblocation/etc/etc/mything.jpg. That works fine.

I noticed in the CDN logs that a browser is looking for https://placeiwant.somewhere/favicon.ico. That file does not exist, and if I point my browser to that URI, I get this error message:

<?xml version="1.0" encoding="ISO-8859-1"?>
<Error>
<Code>OutOfRangeInput</Code>
<Message>One of the request inputs is out of range. RequestId:nnnnnnnn-nnnn-nnnn-nnnn-nnnnnnnnnnnn Time:2020-09-10T13:47:48.5273562Z</Message>
</Error>

In addition to Container, I also have a static website set up in $web with CDN layered on top at https://webplaceiwant.somewhere, and a favicon.ico exists there, but I do not see a way to have that favicon.ico served when https://placeiwant.somewhere/ is accessed.

Thanks.

Answer 1

Generally, the web server will request the favicon.icofile when loading websites. When the CDN request responds to 400 error. I also could reproduce this error message displays when a browser is looking for https://placeiwant.somewhere/favicon.ico. It looks like it's an expected result.

For the static website set up in $web container with CDN. You can just place this favicon.ico file under the $web container.

When you browse the static website's primary endpoint, you will see the icon.

If this does not work for you. You can try to create a storage account v2 via the Azure portal because I have another storage account created by terraform that also appears this issue even I place the same static websites.