rewrite的小结
rewrite主要考虑两个问题：
1. url rewrite.
www.3renyou.com/place/placeView.htm?placeId=1910
www.3renyou.com/place/noteView.htm?noteId=1910
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www.3renyou.com/place/100
www.3renyou.com/place/note/100

2. url broker