how to detect the character encoding in a web page ?

[iMath]

在 2012å¹´12月24日星期一UTC+8上åˆ8æ—¶34分47秒，iMath写é“：

how to detect the character encoding in a web page ?

such as this page



http://python.org/

here is one thread that can help me understanding my code
http://stackoverflow.com/questions/...a-web-page-programmatically/17009285#17009285