client.go
func Get(dst []byte, url string) (statusCode int, body []byte, err error) {
	return defaultClient.Get(dst, url)
}
func Get(dst []byte, url string) (statusCode int, body []byte, err error) {
	return defaultClient.Get(dst, url)
}
// Get 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.