client.go
func GetTimeout(dst []byte, url string, timeout time.Duration) (statusCode int, body []byte, err error) {
	return defaultClient.GetTimeout(dst, url, timeout)
}
func GetTimeout(dst []byte, url string, timeout time.Duration) (statusCode int, body []byte, err error) {
	return defaultClient.GetTimeout(dst, url, timeout)
}
// GetTimeout returns the status code and body of url.
//
// The contents of dst will be replaced by the body and returned, if the dst
// is too small a new slice will be allocated.
//
// The function follows redirects. Use Do* for manually handling redirects.
//
// ErrTimeout error is returned if url contents couldn't be fetched
// during the given timeout.