Function title

ch5/title2/title.go:33–62

!+

(url string)

//!+
func title(url string) error {
	resp, err := http.Get(url)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	ct := resp.Header.Get("Content-Type")
	if ct != "text/html" && !strings.HasPrefix(ct, "text/html;") {
		return fmt.Errorf("%s has type %s, not text/html", url, ct)
	}

	doc, err := html.Parse(resp.Body)
	if err != nil {
		return fmt.Errorf("parsing %s as HTML: %v", url, err)
	}

	// ...print doc's title element...
	//!-
	visitNode := func(n *html.Node) {
		if n.Type == html.ElementNode && n.Data == "title" &&
			n.FirstChild != nil {
			fmt.Println(n.FirstChild.Data)
		}
	}
	forEachNode(doc, visitNode, nil)
	//!+

	return nil
}

//!-