fetchurl

var (
	// ErrUnsupportedAlgorithm is returned when the requested hash algorithm is not supported.
	ErrUnsupportedAlgorithm = errors.New("unsupported algorithm")

	// ErrHashMismatch is returned when the downloaded content does not match the expected hash.
	ErrHashMismatch = errors.New("hash mismatch")

	// ErrPartialWrite is returned when data was already written to Out before a failure occurred,
	// making fallback to another source unsafe.
	ErrPartialWrite = errors.New("partial write")

	// ErrAllSourcesFailed is returned when no server or direct source could provide the content.
	ErrAllSourcesFailed = errors.New("all sources failed")
)