启用保持活动(页面速度)

Question

有什么keep-alive特点？我该如何启用它？

以下是chrome的Page Speed插件的输出.

启用Keep-Alive主机{MYWEBSITE.COM}应启用Keep-Alive.它提供以下资源.

http://MYWEBSITE.com/
http://MYWEBSITE.com/fonts/AGENCYR.TTF
http://MYWEBSITE.com/images/big_mini/0002_mini.jpeg
http://MYWEBSITE.com/images/big_mini/0003_mini.jpeg
http://MYWEBSITE.com/images/big_mini/0004_mini.jpeg
http://MYWEBSITE.com/images/big_mini/0005_mini.jpeg
http://MYWEBSITE.com/images/big_mini/0006_mini.jpeg
http://MYWEBSITE.com/images/big_mini/0007_mini.jpeg
http://MYWEBSITE.com/images/.jpeg
http://MYWEBSITE.com/images/small/0002S.jpeg
http://MYWEBSITE.com/images/small/0003S.jpeg
http://MYWEBSITE.com/images/small/0004S.jpeg
http://MYWEBSITE.com/images/small/0005S.jpeg
http://MYWEBSITE.com/images/small/0006S.jpeg
http://MYWEBSITE.com/images/small/0007S.jpeg
http://MYWEBSITE.com/images/small/0008S.jpeg
http://MYWEBSITE.com/images/small/0009S.jpeg
http://MYWEBSITE.com/images/small/0010S.jpeg
http://MYWEBSITE.com/images/small/0011S.jpeg
http://MYWEBSITE.com/images/small/0012S.jpg
http://MYWEBSITE.com/images/small/0013S.jpeg
http://MYWEBSITE.com/images/small/0014S.jpeg
http://MYWEBSITE.com/images/small/0015S.jpeg
http://MYWEBSITE.com/images/small/0016S.jpeg
http://MYWEBSITE.com/images/small/0017S.jpeg
http://MYWEBSITE.com/images/small/0018S.jpeg
http://MYWEBSITE.com/images/small/0019S.jpeg
http://MYWEBSITE.com/yoxview/yoxview.css
http://MYWEBSITE.com/yoxview/images/empty.gif
http://MYWEBSITE.com/yoxview/images/left.png
http://MYWEBSITE.com/yoxview/images/popup_ajax_loader.gif
http://MYWEBSITE.com/yoxview/images/right.png
http://MYWEBSITE.com/yoxview/images/sprites.png
http://MYWEBSITE.com/yoxview/img3_mini.jpeg
http://MYWEBSITE.com/yoxview/jquery.yoxview-2.21.min.js
http://MYWEBSITE.com/yoxview/lang/en.js
http://MYWEBSITE.com/yoxview/yoxview-init.js

Answer 1

HTTP Keep-Alive(也称为HTTP持久连接)将HTTP服务器配置为保持打开连接,以便客户端可以重用它以发送多个请求,从而减少加载页面的开销.每个服务器和环境都不同,因此进行设置取决于您的环境.

简而言之:如果您使用的是HTTP/1.0,则在发出原始请求时(假设您的服务器支持它)添加Connection: Keep-Alive标头.如果服务器支持它,它将返回相同的标题.如果您正在使用HTTP/1.1并且服务器配置正确,它将自动使用持久连接.

Answer 2

请注意,尽管Keep-Alive在低容量时提供了一些好处,但对于中小型站点而言,它在高容量时表现不佳(例如,如果您的博客获得Slashdotted). 这个黑客新闻线程有一些很好的背景信息.

换句话说,虽然许多PageSpeed的建议都是全面的,但是这个建议应该采取一些措施.