Azure Blob: UI CORS errors when storage is configured via env vars; GUI with presigned URLs works

[Kajetan-Grabara-Grabar]

Hi,
I set up Label Studio to work with Azure Storage. I used variables as in the documentation.

      - name: STORAGE_TYPE
        value: azure
      - name: STORAGE_AZURE_ACCOUNT_NAME
        value: loremipsum
      - name: STORAGE_AZURE_CONTAINER_NAME
        value: container-app
      - name: STORAGE_AZURE_FOLDER
        value: ''

Label Studio connects to the storage and uploading works, but in the UI I get a CORS error.

When I create a new project and set up the connection to the cloud via the GUI with presigned URLs, Label Studio works and can read data from Azure Storage.

Expected behavior
Assets should load in the UI without CORS errors when Azure storage is configured via environment variables, just as they do when configured via the GUI with presigned URLs.

Environment (please complete the following information):

• OS: Azure Container Apps (Kubernetes/Linux)
• Label Studio Docker image: 1.22.0rcfbb7e6e7b1991a2fc815fc888f76c176d8dd3254

[heidi-humansignal]

Hello,

Thank you for contacting Label Studio,
Your STORAGE_* environment variables configure persistent storage / uploaded-file storage at the instance level, but this does not automatically behave like a project Source Cloud Storage connector that generates pre-signed (SAS) URLs for the browser.

Could you please ensure the pre signed URL option is enabled while configuring Azure Blob CORS to allow Label Studio to fetch properly the content. More documentation can be found here

Best Regards!

Comment by Oussama Assili
Workflow Run

[Kajetan-Grabara-Grabar]

Hello,

Is there a way to set up pre signed URL option in the ENV variables? That is the only option I am missing.

[heidi-humansignal]

Hello,

I am afraid the Pre Signed URL is a project-level Cloud Storage setting which you can configure in the UI under
** Settings → Cloud Storage → Source Storage and enable “Use pre-signed URLs” **

Comment by Oussama Assili
Workflow Run