The HTTP Content-Range response header is used in range requests to indicate where the content of a response body belongs in relation to a complete resource.
It should only be included in 206 Partial Content or 416 Range Not Satisfiable responses.
Content-Range: <unit> <range>/<size>
Content-Range: <unit> <range>/*
Content-Range: <unit> */<size><unit>The unit for specifying ranges. Currently, only bytes is supported.
<range>A range with the format <range-start>-<range-end>, where <range-start> and <range-end> are integers for the start and end position (zero-indexed & inclusive) of the range in the given <unit>, respectively. * is used in a 416 Range Not Satisfiable response to indicate that the value is not a range.
<size>The total length of the document (or * if unknown).
This 206 Partial Content response shows a partial response, with the Content-Range indicating that it contains the first 1024 bytes of a 146515 byte file.
HTTP/2 206
content-type: image/jpeg
content-length: 1024
content-range: bytes 0-1023/146515
…
(binary content)If the server cannot satisfy the requested range request, it should respond with a 416 Range Not Satisfiable status, and the Content-Range should specify * for the range along with the total size of the resource.
HTTP/2 416
Content-Range: bytes */67589If-Range, Range headersContent-Type206 Partial Content, 416 Range Not Satisfiable status codes