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Single-page application: blob storage annotation's storage not supported?

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Posted on by Willgart

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Hi,

I'm testing Power Pages in SPA mode.

I have pictures stored in annotations configured in blob storage mode.

when I try to get the picture:

https://mysite.powerappsportals.com/_api/file/download/annotation(<guid>)/blob/$value

I got error 501 (not implemented)

this is working fine on a standard Power Pages site (not SPA)

is it planed to support this?

or do we have to use another way to get the pictures / documents? (if yes, how? expect connecting to the blob storage directly)

Thanks.

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sannavajjala87 143 on at

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Single-page application: blob storage annotation's storage not supported?

Hi,

Why You See Error 501 in SPA Mode

The endpoint "_api/file/download/annotation(<guid>)/blob/$value"

is part of the OData file download API used in standard Power Pages sites. In SPA (Single Page Application) mode, this API is not fully implemented yet, which is why you get 501 Not Implemented.

Currently, SPA mode does not support direct file download via the annotation OData endpoint. Microsoft has not announced official support for this yet, so the behavior is expected.

Use the Standard Site Mode

If file download via annotation is critical, consider using the standard Power Pages rendering mode instead of SPA.

Direct Blob Storage Access

Since you configured annotations in Blob Storage mode, you can:

Retrieve the Blob URL from the annotation record.

Use Azure Storage SDK or REST API to serve the file.

This requires proper SAS tokens or managed identity for secure access.

Custom Web API in Power Pages

Create a custom table or API that fetches the blob URL and returns it to the SPA.

Use Liquid templates or Web API calls to bridge the gap.

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