Why is my CSS bundling not working with a bin deployed MVC4 app?

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UPDATE 11/4/2013:

The reason why this happens is because you have .js or .css at the end of your bundle name which causes ASP.NET to not run the request through MVC and the BundleModule.

The recommended way to fix this for better performance is to remove the .js or .css from your bundle name.

So /bundle/myscripts.js becomes /bundle/myscripts

Alternatively you can modify your web.config in the system.webServer section to run these requests through the BundleModule (which was my original answer)

<modules runAllManagedModulesForAllRequests="true">
  <remove name="BundleModule" />
  <add name="BundleModule" type="System.Web.Optimization.BundleModule" />
</modules>

Edit: I also noticed that if the name ends with ‘css’ (without the dot), that is a problem as well. I had to change my bundle name from ‘DataTablesCSS’ to ‘DataTablesStyles’ to fix my issue.

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