HTTP Error 404.3 – Not Found The page you are requesting cannot be served because of the extension configuration. If the page is a script, add


If this is related IIS 7.5 Detailed Error – 404.3  – Not Found

We need to map json or CSS like blow

1- Open your project’s Web.config file
2- Under <system.webServer> add the MIME mapping to handle the file extension you need, like so:

Screenshot_1

 

 

 

 

3- Rebuild the solution and watch for the same error. Most likely this should resolve the issue handling .less files. You can add handlers for any type of file with another <mimeMap fileExtension=” mimeType=”” />

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