User-Agent - [ HTTP 中文开发手册 ] - 在线原生手册

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目錄搜尋

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

文字

的用户代理请求头包含一个特征串，其允许网络协议对等体，以确定请求软件的用户代理的应用程序类型，操作系统，软件供应商或软件版本。

请阅读使用用户代理的浏览器检测，以及为什么向不同的浏览器提供不同的网页或服务通常是一个坏主意。

Header type	Request header
Forbidden header name	no

句法

User-Agent:  /  Common format for web browsers:User-Agent: Mozilla/ ()  ()

指令

产品标识符产品的版本号例如，零个或多个包含子产品信息的注释。

Firefox UA 字符串

有关基于 Firefox 和 Gecko 的用户代理字符串的更多详细信息，请参阅 Firefox 用户代理字符串参考。Firefox 本身的 UA 字符串被分解为四个组件：

Mozilla / 5.0（platform ; rv：geckoversion）Gecko / geckotrailFirefox / firefoxversion

Mozilla / 5.0是一款表示浏览器兼容 Mozilla 的通用标记，并且几乎适用于今天的所有浏览器。

平台描述浏览器运行的本地平台（例如Windows，Mac，Linux 或 Android）以及它是否是手机。Firefox OS 手机只是说“手机”; 网络就是平台。请注意，平台可以由多个“;”分隔的令牌组成。请参阅下面的进一步细节和示例。

rv：geckoversion表示 Gecko 的发布版本（例如“17.0”）。在最近的浏览器中，geckoversion与firefoxversion相同。

Gecko / geckotrail表明浏览器基于 Gecko。

在桌面上，geckotrail是固定字符串“20100101”

Firefox / firefoxversion表示浏览器是 Firefox，并提供版本（例如“ 17.0”）。

例子

Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:42.0) Gecko/20100101 Firefox/42.0

Chrome UA 字符串

Chrome（或Chromium /基于闪烁的引擎）用户代理字符串与 Firefox 格式类似。为了兼容性，它添加了诸如 “KHTML，Gecko” 和 “Safari” 之类的字符串。

例子

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36

Opera UA 字符串

Opera 浏览器也基于 blink 引擎，这就是为什么它看起来几乎相同，但添加了 “OPR / <版本>”。

例子

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36 OPR/38.0.2220.41

Safari UA 字符串

在这个例子中，用户代理字符串是移动 Safari 浏览器版本。它包含“移动”一词。

例子

Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_1 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) Version/10.0 Mobile/14E304 Safari/602.1

Internet Explorer UA 字符串

例子

Mozilla/5.0 (compatible; MSIE 9.0; Windows Phone OS 7.5; Trident/5.0; IEMobile/9.0)

爬虫和机器人 UA 字符串

例子

Googlebot/2.1 (+http://www.google.com/bot.html)

产品规格

Specification	Title
RFC 7231, section 5.5.3: User-Agent	Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content

浏览器兼容性

Feature	Chrome	Edge	Firefox	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)

用户代理检测，历史记录和清单

Firefox用户代理字符串参考

使用用户代理进行浏览器检测