Download Application Request Routing 3.0 Stand-alone package (IExpress) x86 from Official Microsoft Download Center

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Application Request Routing 3.0 Stand-alone package (IExpress) x86

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Microsoft Application Request Routing (ARR) 3 for IIS is a proxy based routing module that forwards HTTP requests to application servers based on HTTP headers and server variables, and load balance algorithms. This version includes ARR 3.0 and its dependecies, so that it provides a single step install for it without using the Web Platform Installer.