[v17][fs_attachment] X-Sendfile feature doesn't work

[taha-adel]

Module

fs_attachment

Describe the bug

I use GCP Object Storage for attachments and it's working fine but when I use the X-Sendfile option and set the Base URL to the domain of the CDN I have in front of the GCS bucket, I still can access the attachment but not through NGINX and CDN.

To Reproduce

Affected versions: 17

Steps to reproduce the behavior:

1. Use GCS Storage bucket for attachments
2. Configure NGINX for X-Sendfile as per the docs
3. Configure the module to work with GCS and to use X-Sendfile and set the Base URL

Expected behavior
I expect to get the attachment through NGINX and the CDN I have in front of the Backend storage bucket.

Additional context
OS Version: Ubuntu 22.04
Python Version: 3.10.12