Internet Explorer 浏览器在同一时刻只能从同一域名下载两个文件。

  至于原因请见 MSDN Blogs:《Internet Explorer and Connection Limits》,如何解除限制请见微软客户帮助与支持主页:《如何将 Internet Explorer 配置为可以同时进行两个以上的下载会话》。

  不管 Firefox 有多火,无可否认,IE 仍然是浏览器市场的老大。所以,在做系统架构时,不得不去考虑 IE 同时只能从同一域名下载两个文件的限制。如果超过两个文件,IE 将会以队列形式等待两个文件下载完毕,再去下载接下来的两个文件。这样,当在一个页面显示多张图片时,IE 用户的图片下载速度就会受到影响。

  百度、新浪、雅虎等网站采用了同一组图片服务器,使用多个二级域名的方式来解决这个问题。

  通过 HttpWatch Professional 5.2.17 分析可以看出,百度的图片搜索采用了 t1.baidu.com ~ t8.baidu.com 八个域名来显示图片,消耗在 IE 浏览器端的 Blocked 时间小于0.001秒,非常快。

  点击在新窗口中浏览此图片


  新浪的图片 CDN 同样采用了 i0.sinaimg.cn ~ i3.sinaimg.cn 四个域名来显示图片,消耗在 IE 浏览器端的 Blocked 时间也是0.001秒。新浪采用独立的顶级域名 sinaimg.cn 而非 ***.sina.com.cn 域名作为图片服务器域名,还有一个好处,就是 sina.com.cn 域下的 Cookie 信息不会被带到 sinaimg.cn 域下,提高了图片服务器解析 header 头的速度。

  点击在新窗口中浏览此图片


  再看网易相册的一组图片服务器,只使用 pics.photo.163.com 一个域名,消耗在 IE 浏览器端的 Blocked 时间为0.647秒,就比较慢了。

  点击在新窗口中浏览此图片



技术大类 » Web服务器 | 评论(52) | 引用(1) | 阅读(63992)
sheepchang Email
2008-5-2 08:35
今天是你大婚的喜庆日子,祝你新婚快乐,早生贵子!grin
看看我写的这个 分布式图片上传存储浏览解决方案 http://www.svnhost.cn/Article/Detail-62.shtml
一笑而过
2008-7-10 19:12
支持。。
handan Email Homepage
2008-7-17 16:11
我目前在做一个WebGIS的地图程序,会涉及到下载多个图片,
当拖动的时候,Client需要请求服务器上的图片,图片是动态生成的,但是当缩放级别大于12的时候,地图就开始不显示,需要鼠标点击一下,才可以显示,我不知道这是什么原因,Firefox下是完全正常的,我不知道是否和你描述的情况一样!
这个问题,我换不知道怎么解决,谢谢!
TanCee Homepage
2008-9-7 20:09
学习了。
HH
2008-10-27 17:18
图片有大有小,方法纯属误导
张宴 回复于 2008-10-27 17:27
请注意 图中的 Blocked 时间

另外,按你的说法,就算图片有大有小,通过receive值可以看出,但百度、新浪的图片比网易还大,耗费的时间却是0.0x秒,而网易的是0.x秒。
newbie
2008-10-29 13:15
想请教一下, 在页面中如何调用这些独立的服务器,是随机选择吗?
或者是其他的技术方式。要是有推荐我读的资料就更好了。

经常看你的blog。非常感谢。
sfss
2009-6-17 07:50
fwe
2009-6-17 13:02
Ophone Homepage
2009-7-2 11:15
原来如此
aaa
2009-9-10 10:32
超级便宜的机票网站.
aaa
2009-9-10 10:33
超级便宜的机票网站.
Victor Email
2010-2-25 10:31
只有一台web服务器的情况下,如果我使用rewrite,改写图片链接到另一个二级域名,同时在服务器上面添加一个vhost,这样子会提高访问效率么?我尝试了一下,Yslow测完分数还降低了,因为重定向消耗了更多的时间,有没有更好的办法,在不改动程序的情况下实现呢?
dgfgh
2010-4-17 15:56
谢谢学到东西了,我也想着舒服,穿件http://www.51ggs.com/zhizuo.htm" target="_blank">T恤衫就上场吧
jianzi Email Homepage
2010-5-2 16:53
为什么我优化了之后会出现很多的206状态呢????
bdnet Email
2010-6-12 23:12
一直有个疑问,图片加速还搞个特别的独立域名,还分了数个二级域名,原来用以如此,看了这篇文,haha…
Ie就是麻烦,诶,谁叫他是老大捏。zan
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