October 2015
Beginner to intermediate
400 pages
14h 44m
English
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5.8 Deferred Function Calls
Our findLinks examples used the output of http.Get
as the input to html.Parse.
This works well if the content of the requested URL is indeed HTML,
but many pages contain images, plain text, and other file formats.
Feeding such files into an HTML parser could have undesirable
effects.
The program below fetches an HTML document and prints its title.
The title function inspects the Content-Type header of
the server’s response and returns an error if the document is not
HTML.
gopl.io/ch5/title1
func title(url string) error { resp, err := http.Get(url) if err != nil { return err } // Check Content-Type is HTML (e.g., "text/html; charset=utf-8"). ct := resp.Header.Get("Content-Type") if ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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