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

例如，如果Content-Language: de-DE設置了“ ”，它表示該文件是用于德語的人（但是，它并不表示該文件是用德語寫的，例如，它可能是用英語寫成的，作為語言課程的一部分為德語人士）。

如果Content-Language未指定，則默認情況下內(nèi)容適用于所有語言受眾。多語言標簽也是可能的，以及將Content-Language標題應用于各種媒體類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

語法

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

指令

language-tag多個語言標簽用逗號分隔。每個語言標記都是一個或多個不區(qū)分大小寫的子標記的序列，每個子標記都用連字符（“ -”，“ %x2D）分隔。在大多數(shù)情況下，語言標簽由標識相關(guān)語言的廣泛系列的主要語言子標簽組成（例如“ en”=英語），可選地后跟一系列細化或縮小該語言范圍的子標簽（例如“ en-CA“=在加拿大傳達的英語的多樣性）。

注意：語言標記在 RFC 5646中形式化地定義，它繼承 ISO 639標準（通常是 ISO 639-1代碼列表）以用于要使用的語言代碼。

例子

指示文檔被寫入的語言

全局lang屬性用于 HTML 元素以指示整個 HTML 文檔或其中一部分的語言。

<html lang="de">

千萬不能使用這樣這個薈萃元素說明文檔語言：

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

指示資源的目標受眾

Content-Language頭用于指定 頁面的目標受眾 ，并能表明這是一種以上的語言。

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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