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characters

非標準

這個功能是非標準的，不在標準軌道上。不要在面向 Web 的生產站點上使用它：它不適用于每個用戶。實現之間也可能存在很大的不兼容性，并且行為在未來可能會發(fā)生變化。

Keep-Alive一般報頭允許發(fā)送者提示關于如何連接，并且可以被用于設置超時時間，并且請求的最大數量。

Connection頭需要被設置為“?；睢边@個標題有任何意義。此外，Connection和Keep-Alive在 HTTP / 2 忽略; 連接管理由其他機制處理。

Header type

General header

Forbidden header name

no

句法

Keep-Alive: parameters

指令

_parameters_ 逗號分隔的參數列表，每個參數都包含由等號（'='）分隔的標識符和值。以下標識符是可能的：

  • timeout：指示空閑連接必須保持打開的最短時間（以秒為單位）。請注意，如果在傳輸級別上未設置保持活動 TCP 消息，則可能會忽略超過 TCP 超時的超時。

  • max：指示在關閉它之前可以在此連接上發(fā)送的最大請求數。除非0，對于非流水線連接，此值將被忽略，因為另一個請求將在下一個響應中發(fā)送。HTTP 管道可以使用它來限制流水線。

例子

包含Keep-Alive標題的響應：

HTTP/1.1 200 OK
Connection: Keep-Alive
Content-Encoding: gzip
Content-Type: text/html; charset=utf-8Date: Thu, 11 Aug 2016 15:23:13 GMT
Keep-Alive: timeout=5, max=1000Last-Modified: Mon, 25 Jul 2016 04:32:39 GMT
Server: Apache(body)

產品規(guī)格

Specification

Title

HyperText Transport Protocol Keep-Alive Header

The Keep-Alive Header (Experimental specification)

RFC 7230, section appendix-A.1.2: Keep-Alive

Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing

瀏覽器兼容性

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)

請參閱

  • Connection

  • HTTP / 1.x 中的連接管理

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