Internal mechanism: 1.ihttpmodule (adhesive, listening Application event or user custom event.) 2.IHttphandler (can be customized to specific resources) 2.IHttphandlerFactory (can be used in custom IHTTPMODULE or standard) Ihttpmodule is selected)
IHTTPHANDLER intercepted httpRequest.ihttpmodule is an event listener (its role is some of Glob.aspx)
