Content-Range

The Content-Range response HTTP header indicates where in a full body message a partial message belongs.

Header type	Response header, Payload header
Forbidden header name	no
CORS-safelisted response-header	no

Syntax

Content-Range: <unit> <range-start>-<range-end>/<size>
Content-Range: <unit> <range-start>-<range-end>/*
Content-Range: <unit> */<size>

<unit>: The unit in which ranges are specified. This is usually bytes.
<range-start>: An integer in the given unit indicating the start position (zero-indexed & inclusive) of the request range.
<range-end>: An integer in the given unit indicating the end position (zero-indexed & inclusive) of the requested range.
<size>: The total length of the document (or '*' if unknown).

Content-Range: bytes 200-1000/67589

Specification
HTTP Semantics # field.content-range

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