S3 Presigned Url 403 _verified_ Download -

Even with a valid presigned URL, bucket-level settings can override access. S3 PresignedURL Limitations - AWS re:Post

: A URL presigned for a GET request (download) will return a 403 if the client attempts a different method, such as HEAD or PUT . 3. URL Expiration s3 presigned url 403 download

: If the URL was generated using temporary credentials (e.g., from an IAM role or STS), it will become invalid as soon as those original credentials expire, even if the URL’s own expiration time has not yet passed. 2. Signature Mismatch ( SignatureDoesNotMatch ) Even with a valid presigned URL, bucket-level settings

: The signing entity must have s3:GetObject permissions for the specific bucket and key at the time the URL is used. URL Expiration : If the URL was generated

The most common cause of a 403 error is that the IAM user or role used to the presigned URL does not have the necessary permissions.