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Content-Language 實(shí)體頭用于描述旨在為觀眾的語(yǔ)言（S），使得其允許用戶(hù)根據(jù)用戶(hù)自己的優(yōu)選語(yǔ)言區(qū)分。

例如，如果Content-Language: de-DE設(shè)置了“ ”，它表示該文件是用于德語(yǔ)的人（但是，它并不表示該文件是用德語(yǔ)寫(xiě)的，例如，它可能是用英語(yǔ)寫(xiě)成的，作為語(yǔ)言課程的一部分為德語(yǔ)人士）。

如果Content-Language未指定，則默認(rèn)情況下內(nèi)容適用于所有語(yǔ)言受眾。多語(yǔ)言標(biāo)簽也是可能的，以及將Content-Language標(biāo)題應(yīng)用于各種媒體類(lèi)型而不僅僅是文本文檔。

Header type

Entity header

Forbidden header name

no

CORS-safelisted response-header

yes

CORS-safelisted request-header

yes

語(yǔ)法

Content-Language: de-DE
Content-Language: en-US
Content-Language: de-DE, en-CA

指令

language-tag多個(gè)語(yǔ)言標(biāo)簽用逗號(hào)分隔。每個(gè)語(yǔ)言標(biāo)記都是一個(gè)或多個(gè)不區(qū)分大小寫(xiě)的子標(biāo)記的序列，每個(gè)子標(biāo)記都用連字符（“ -”，“ %x2D）分隔。在大多數(shù)情況下，語(yǔ)言標(biāo)簽由標(biāo)識(shí)相關(guān)語(yǔ)言的廣泛系列的主要語(yǔ)言子標(biāo)簽組成（例如“ en”=英語(yǔ)），可選地后跟一系列細(xì)化或縮小該語(yǔ)言范圍的子標(biāo)簽（例如“ en-CA“=在加拿大傳達(dá)的英語(yǔ)的多樣性）。

注意：語(yǔ)言標(biāo)記在 RFC 5646中形式化地定義，它繼承 ISO 639標(biāo)準(zhǔn)（通常是 ISO 639-1代碼列表）以用于要使用的語(yǔ)言代碼。

例子

指示文檔被寫(xiě)入的語(yǔ)言

全局lang屬性用于 HTML 元素以指示整個(gè) HTML 文檔或其中一部分的語(yǔ)言。

<html lang="de">

千萬(wàn)不能使用這樣這個(gè)薈萃元素說(shuō)明文檔語(yǔ)言：

<!-- /!\ This is bad practice --><meta http-equiv="content-language" content="de">

指示資源的目標(biāo)受眾

Content-Language頭用于指定 頁(yè)面的目標(biāo)受眾 ，并能表明這是一種以上的語(yǔ)言。

Content-Language: de, en

規(guī)范

Specification

Title

RFC 7231, section 3.1.3.2: Content-Language

Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content

瀏覽器兼容性

Feature

Chrome

Firefox

Edge

Internet Explorer

Opera

Safari

Basic Support

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

Feature

Android

Chrome for Android

Edge mobile

Firefox for Android

IE mobile

Opera Android

iOS Safari

Basic Support

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

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