The built-in Web server of Reporting Services uses the kernel level HTTP handler, HTTP.SYS that is part of Win ¬dows 2003 and later and is used by lIS as well. This means that unlike the Cassini web server which is part of Visual Studio and used for development purposes only, the Web server that is part of Re¬porting Services is a full-fledged, enterprise grade one that can be used in production as well.

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The web server also has a number of enhancements and optimizations specific to Reporting Services - something that lIS doesn't have. This also takes care of all the authentication mechanisms (windows, basic, anonymous), memory management of the service, providing a web service end point and hosting the Report Manager web site for end users and administrators. It also allows mi¬gration of lIS settings from previous versions of Reporting Services 2000 and 2005.