http://www.cnblogs.com/1-2-3/archive/2007/09/01/877290.html
实战 HTTP 处理程序(HTTP Handler) (1) -- 创建一个最简单的 HTTP Handler
http://msdn2.microsoft.com/en-us/library/ms972974.aspx
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URL Rewriting in ASP.NET
http://www.cnblogs.com/1-2-3/archive/2007/09/05/http-handler-print-barcode.html
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