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Guides Access control CORS Authentication Browser detection using the user agent Caching Caching FAQ Compression Conditional requests Connection management in HTTP 1.x Content negotiation Content negotiation: List of default Accept values Cookies CSP Messages Overview Protocol upgrade mechanism Proxy servers and tunneling Proxy servers and tunneling: Proxy Auto-Configuration (PAC) file Public Key Pinning Range requests Redirections Resources and specifications Resources and URIs Response codes Server-Side Access Control Session Guides: Basics Basics of HTTP Choosing between www and non-www URLs Data URIs Evolution of HTTP Identifying resources on the Web MIME Types MIME types: Complete list of MIME types CSP Content-Security-Policy Content-Security-Policy-Report-Only CSP: base-uri CSP: block-all-mixed-content CSP: child-src CSP: connect-src CSP: default-src CSP: font-src CSP: form-action CSP: frame-ancestors CSP: frame-src CSP: img-src CSP: manifest-src CSP: media-src CSP: object-src CSP: plugin-types CSP: referrer CSP: report-uri CSP: require-sri-for CSP: sandbox CSP: script-src CSP: style-src CSP: upgrade-insecure-requests CSP: worker-src Headers Accept Accept-Charset Accept-Encoding Accept-Language Accept-Ranges Access-Control-Allow-Credentials Access-Control-Allow-Headers Access-Control-Allow-Methods Access-Control-Allow-Origin Access-Control-Expose-Headers Access-Control-Max-Age Access-Control-Request-Headers Access-Control-Request-Method Age Allow Authorization Cache-Control Connection Content-Disposition Content-Encoding Content-Language Content-Length Content-Location Content-Range Content-Type Cookie Cookie2 Date DNT ETag Expect Expires Forwarded From Headers Host If-Match If-Modified-Since If-None-Match If-Range If-Unmodified-Since Keep-Alive Large-Allocation Last-Modified Location Origin Pragma Proxy-Authenticate Proxy-Authorization Public-Key-Pins Public-Key-Pins-Report-Only Range Referer Referrer-Policy Retry-After Server Set-Cookie Set-Cookie2 SourceMap Strict-Transport-Security TE Tk Trailer Transfer-Encoding Upgrade-Insecure-Requests User-Agent User-Agent: Firefox Vary Via Warning WWW-Authenticate X-Content-Type-Options X-DNS-Prefetch-Control X-Forwarded-For X-Forwarded-Host X-Forwarded-Proto X-Frame-Options X-XSS-Protection Methods CONNECT DELETE GET HEAD Methods OPTIONS PATCH POST PUT Status 100 Continue 101 Switching Protocols 200 OK 201 Created 202 Accepted 203 Non-Authoritative Information 204 No Content 205 Reset Content 206 Partial Content 300 Multiple Choices 301 Moved Permanently 302 Found 303 See Other 304 Not Modified 307 Temporary Redirect 308 Permanent Redirect 400 Bad Request 401 Unauthorized 403 Forbidden 404 Not Found 405 Method Not Allowed 406 Not Acceptable 407 Proxy Authentication Required 408 Request Timeout 409 Conflict 410 Gone 411 Length Required 412 Precondition Failed 413 Payload Too Large 414 URI Too Long 415 Unsupported Media Type 416 Range Not Satisfiable 417 Expectation Failed 426 Upgrade Required 428 Precondition Required 429 Too Many Requests 431 Request Header Fields Too Large 451 Unavailable For Legal Reasons 500 Internal Server Error 501 Not Implemented 502 Bad Gateway 503 Service Unavailable 504 Gateway Timeout 505 HTTP Version Not Supported 511 Network Authentication Required Status
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Accept-Language請(qǐng)求的 HTTP 標(biāo)頭通告哪些語(yǔ)言客戶端是能夠理解，并且其區(qū)域的變體是優(yōu)選的。使用內(nèi)容協(xié)商，服務(wù)器然后選擇其中一個(gè)提議，使用它并通過(guò)Content-Language響應(yīng)頭通知客戶它的選擇。瀏覽器根據(jù)它們的用戶界面語(yǔ)言為該標(biāo)題設(shè)置足夠的值，并且即使用戶可以改變它，這也很少發(fā)生（并且因?yàn)樗鼘?dǎo)致指紋）而被忽視。

當(dāng)服務(wù)器無(wú)法通過(guò)另一種方式確定語(yǔ)言時(shí)，使用此標(biāo)題是一種暗示，例如特定的 URL ，由明確的用戶決定控制。建議服務(wù)器不要重寫明確的決定。該內(nèi)容Accept-Language通常不受用戶的控制（例如在不同國(guó)家旅行和使用網(wǎng)吧時(shí)）; 用戶可能還想用除用戶界面的語(yǔ)言環(huán)境之外的其他語(yǔ)言訪問(wèn)頁(yè)面。

如果服務(wù)器無(wú)法提供任何匹配的語(yǔ)言，理論上可以發(fā)回406（不可接受的）錯(cuò)誤代碼。但是，為了獲得更好的用戶體驗(yàn)，很少做到這一點(diǎn)，更常見(jiàn)的方式是Accept-Language在這種情況下忽略 header 。

Header type

Request header

Forbidden header name

no

CORS-safelisted request-header

yes

語(yǔ)法

Accept-Language: <language>Accept-Language: <locale>Accept-Language: *// Multiple types, weighted with the quality value syntax:Accept-Language: fr-CH, fr;q=0.9, en;q=0.8, de;q=0.7, *;q=0.5

指令

<language>以2或3個(gè)字符的字符串表示的語(yǔ)言。

<locale>完整的語(yǔ)言標(biāo)簽。除了語(yǔ)言本身之外，它可能包含更多的信息'-'。最常見(jiàn)的額外信息是國(guó)家變體（如'en-US'）或使用的字母類型（如'sr-Lat'）。其他類似正字法（'de-DE-1996'）的變體通常不用于此標(biāo)題的上下文中。

*任何語(yǔ)言; '*'被用作通配符。

;q=（q因子權(quán)重）使用稱為權(quán)重的相對(duì)質(zhì)量值以優(yōu)先順序表示的任何值。

例子

Accept-Language: de

Accept-Language: de-CH

Accept-Language: en-US,en;q=0.5

規(guī)范

Specification

Title

RFC 7231, section 5.3.5: Accept-Language

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

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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