OptionalallowOptionalblockBlock size for a BlockedSource. Set to null to disable blocking and caching.
OptionalcacheThe number of blocks to cache.
OptionalforceWhen the Fetch API would be used, force using XMLHttpRequest instead.
OptionalheadersAdditional headers to add to each request
OptionalmaxMaximum number of ranges to request in a single HTTP request. 0 means no multi-range requests.
Whether to allow full file responses when requesting ranges