A client is an HTTP client. Its value zero (DefaultClient) is a usable client that uses DefaultTransport.

type Client struct {
	Transport RoundTripper
	CheckRedirect func(req *Request, via []*Request) error
	Jar CookieJar
	Timeout time.Duration
}
                        

Client Transport is typically internally stateful (cached TCP connections), so Clients should be reused rather than created as needed. Clients are safe for concurrent use by several goroutines.