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Get file contents via presigned redirect (ASK-205)

GET 
/files/:file_id/download

Returns 302 with a freshly-minted presigned S3 GET URL in the Location header. The browser follows the redirect and loads the bytes directly from object storage. Presigned URL TTL is 15 minutes; clients with long-lived references (e.g. <img src> baked into study-guide markdown) keep pointing at this stable endpoint and get a new signed URL on every request.

Grants are respected -- the viewer must own the file or hold a direct view grant (or the public sentinel). Files in pending / failed / soft-deleted states return 404 so callers can't distinguish "not ready" from "forbidden".

Request​

Responses​

Redirect to a freshly-minted presigned S3 GET URL (15-min TTL). The browser follows the Location header and loads bytes directly from object storage.

Response Headers
    Location

    Presigned S3 GET URL.