Content-Range

For partial responses, indicates which portion of the resource is included in the response.

Fastly reads this header from responses and writes it into responses. It is defined by an external standard.

The Content-Range header field is sent in a single part 206 (Partial Content) response to indicate the partial range of the selected representation enclosed as the message payload, sent in each part of a multipart 206 response to indicate the range enclosed within each body part, and sent in 416 (Range Not Satisfiable) responses to provide information about the selected representation.