Does HeadObject prove that an uploaded file is a valid image?
No. It retrieves metadata and can confirm object existence and size. Validating image content requires additional trusted checks against the actual bytes and processing limits.
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More FAQs in How should the backend verify that a file was uploaded successfully?
No. The backend must verify the server-recorded object and its requirements. Client claims cannot establish storage ownership, actual size, or the validity of image content.
The object could be replaced after validation while upload permission remains valid. Design finalization so the accepted photo cannot silently change to unvalidated content.
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