HttpContext.Request.Path changed before Application_BeginRequest fired

I have a URL Re-writer in place however it is run after the event Application_BeginRequest is fired in my Global.asax file. For some reason when I type the fol开发者_如何转开发lowing URL

http://localhost:1002/mysite/leaders/all-time/page-2/

it is stripping the page-2 part off before it even reaches the Application_BeginRequest event, any ideas?