benroeder opened a new issue, #7213:
URL: https://github.com/apache/opendal/issues/7213

   The Swift backend does not support presigned URLs. Swift provides TempURL 
middleware that generates HMAC-signed URLs with expiration, equivalent to S3's 
presigned URLs.
   
   TempURL requires a shared secret key configured on the Swift account or 
container (`X-Account-Meta-Temp-URL-Key`) and supports SHA1, SHA256, and SHA512 
algorithms.
   
   References:
   - https://docs.openstack.org/swift/latest/api/temporary_url_middleware.html
   - https://github.com/openstack/swift/blob/master/swift/common/digest.py


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