OptionalheadersThe HTTP headers.
Optionalusetrue to rely XMLHttpRequest instead of fetch to fetch data.
OptionalfetchThe function used to fetch the data. It takes precedence over HttpRangeOptions#useXHR
when set. The returned object must expose the status, statusText and headers properties,
and the arrayBuffer() method of the Response class.
Optionalinit: RequestInit
Represents options passed to the constructor of HttpRangeReader and HttpReader.