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https://developer.mozilla.org/en-US/docs/The_life_of_an_HTML_HTTP_request
http://www.html5rocks.com/en/tutorials/internals/howbrowserswork/
http://taligarsiel.com/Projects/howbrowserswork1.htm
The life of an HTML HTTP request
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原文地址：http://www.cnblogs.com/daishuguang/p/4192768.html
