1 // Copyright 2016 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
12 "golang.org/x/text/language"
15 // matcher is a language.Matcher configured for all supported languages.
16 var matcher = language.NewMatcher([]language.Tag{
17 language.BritishEnglish,
22 // handler is a http.HandlerFunc.
23 func handler(w http.ResponseWriter, r *http.Request) {
24 t, q, err := language.ParseAcceptLanguage(r.Header.Get("Accept-Language"))
25 // We ignore the error: the default language will be selected for t == nil.
26 tag, _, _ := matcher.Match(t...)
27 fmt.Printf("%5v (t: %6v; q: %3v; err: %v)\n", tag, t, q, err)
30 func ExampleParseAcceptLanguage() {
31 for _, al := range []string{
32 "nn;q=0.3, en-us;q=0.8, en,",
33 "gsw, en;q=0.7, en-US;q=0.8",
37 // Create dummy request with Accept-Language set and pass it to handler.
38 r, _ := http.NewRequest("GET", "example.com", strings.NewReader("Hello"))
39 r.Header.Set("Accept-Language", al)
44 // en-GB (t: [ en en-US nn]; q: [ 1 0.8 0.3]; err: <nil>)
45 // en-GB (t: [ gsw en-US en]; q: [ 1 0.8 0.7]; err: <nil>)
46 // de (t: [ gsw nl da]; q: [ 1 1 1]; err: <nil>)
47 // en-GB (t: []; q: []; err: language: tag is not well-formed)