}
	}
}

func doCrawl(url string) error {
	defer wg.Done()

	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return err
	}
	res, err := http.DefaultTransport.RoundTrip(req)
	if err != nil {
		return err
	}
	// Handle redirects.
	if res.StatusCode/100 == 3 {
		newURL, err := res.Location()
		if err != nil {

pkg net/http, type Transport struct, TLSClientConfig *tls.Config
pkg net/http, var DefaultClient *Client
pkg net/http, var DefaultServeMux *ServeMux
pkg net/http, var DefaultTransport RoundTripper
pkg net/http, var ErrBodyNotAllowed error
pkg net/http, var ErrBodyReadAfterClose error
pkg net/http, var ErrContentLength error
pkg net/http, var ErrHandlerTimeout error