HTTP Architecture
Although SSRS does a lot of web-related tasks on Windows Server, keep in mind that it doesn’t rely on Internet Information Services (IIS) at all. There are no IIS-based websites or applications to configure. Any ISAPI extensions, virtual directory settings, or other advanced web customizations you may have built are probably not compatible with the SSRS HTTP architecture.
To process HTTP requests for SSRS web services, Report Manager ASPX pages, and other calls, SSRS 2012 natively hosts the .NET Framework and ASP.NET. It ties directly in with operating system level (or kernel mode) HTTP, listening for requests by way of the Windows HTTP API (sometimes referred to as http.sys). This means that under the covers, SSRS registers ...
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