BitRateToByteDuration returns the duration between bytes for a given bit rate in bits per second, rounded down to nanoseconds.

NewLowercaseHeaders returns a map of headers for the given http.Header with all header names in lower-case.

Changed only during tests.

Download wraps the retrieval of a resource at a URL using HTTP GET requests and exposes the received data through its implementation of the io.Reader interface.

Downloader has helper functions for common use cases of Download, such as writing a resource to a file while downloading it, downloading multiple resources in parallel and verifying the hashsum or signature of downloading resources.

TimeoutingReader wraps an io.Reader with a configurable timeout.

DownloadProgressHandler is an interface which defines callbacks for typical events which will or may occur during a resource download via an HTTP GET request, such as receiving bytes, the connection being interrupted or a bad HTTP response code being received.

LowercaseHeaders models http.Header with each header name being lower-case.