找到用户打算查看的页面

I'm rebuilding a site with a lot of incoming links, and the URL structure is completely changing. I'm using the stock mod_rewrite solution to redirect all old links to new pages. However, as I'm sure a few links will slip through the net, I've built a small script that runs on my custom 404 page, to log the incoming visitors' referrer URL. This will help me track down any broken links.I'm rebuilding a site with a lot of incoming li