How Do I Check Whether Range Requests Are Supported for Origin Pull?
Check the response of the origin server. If the response contains the Content-Range field, range requests are supported for origin pull.
For example, Content-Range: bytes 0-100/2600 indicates that bytes from 0 to 100 are requested and the total data size is 2,600 bytes.
The status code of range requests is 206 instead of 200.