If you’re deploying a WCF Web API application to your IIS 7.x you might receive a HTTP Error 404.0 (MapRequestHandler / StaticFile):As you know, WCF Web API relies on .NET Framework 4.0.So lets take a look into the application pool for our application:Everything looks fine here.So lets dig a little bit deeper – namely inspect the ISAPI Filters:Looks like ASP.NET 4 is missing here… so lets fix it:PS C:\Windows\Microsoft.NET\Framework64\v4.0.30319> .\aspnet_regiis.exe -i Start installing ASP.NET (4.0.30319). ........ Finished installing ASP.NET (4.0.30319). Now hit F5 in your browser:(If it’s not working after installing ASP.NET 4.0.x please review the version in your application pools settings again and fix it if necessary).
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