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HTTP_STATUS_RANGE_NOT_SATISFIABLE
This commonly occurs when a client resumes a download using an offset beyond the current file length or after the resource changed. The response can include Content-Range: bytes */length to reveal the current length.
Discard stale range metadata, revalidate the resource, and restart or adjust the range. Do not concatenate partial content from different versions of the same resource.
The response can include Content-Range with the current representation length, which helps a client recognize an obsolete resume offset. Recheck the local partial-file size and validators before choosing a new range. If the representation changed, restart or revalidate rather than appending bytes from a different version.
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