从http协议看无法获取网页charset的原因
原始问题如下：http://topic.csdn.net/u/20080902/02/a6445aa1-2e6b-45c6-a47c-79009718c0fa.html
html网页的内容大致如下：<div class="highlighter">
[*]<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><span />
[*]<span /><html><span />
[*]<span /><head><span />
[*]<span /><meta http-equiv="Content-Type;charset=gb2312" />
[*]<span />
[*]<span /><title>CSDN首页 </title><span />
[*]...
[*]<span /></head><span />
[*]<span /><body><span />
[*].....
[*]<span /></html>
页:
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