Progressively supply media data

I'm trying to use the resourceLoader of an AVAsset to progressively supply media data. Unable to because the delegate asks for the full content requestsAllDataToEndOfResource = true.

class ResourceLoader: NSObject, AVAssetResourceLoaderDelegate {
    func resourceLoader(_ resourceLoader: AVAssetResourceLoader, shouldWaitForLoadingOfRequestedResource loadingRequest: AVAssetResourceLoadingRequest) -> Bool {
        if let ci = loadingRequest.contentInformationRequest {
            ci.contentType = // public.mpeg-4
            ci.contentLength = // GBs
            ci.isEntireLengthAvailableOnDemand = false
            ci.isByteRangeAccessSupported = true
        }
        if let dr = loadingRequest.dataRequest {
            if dr.requestedLength > 200_000_000 {
                // memory pressure
                // dr.requestsAllDataToEndOfResource is true
            }
        }
        return true
    }
}

Also tried using a fragmented MP4 created using AVAssetWriter. But didn't work. Please let me know if it's possible for the AVAssetResourceLoader to not ask for the full content?