fn := c.CheckRedirect
	if fn == nil {
		fn = defaultCheckRedirect
	}
	return fn(req, via)
}

// redirectBehavior describes what should happen when the
// client encounters a 3xx status code from the server.
func redirectBehavior(reqMethod string, resp *Response, ireq *Request) (redirectMethod string, shouldRedirect, includeBody bool) {
	switch resp.StatusCode {
	case 301, 302, 303: