how to get Detailed 500 error , ASP on IIS 7.5

How to configure your Web.Config file to show Detailed 500 error, like classic asp.

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
	<system.webServer>
		<httpErrors errorMode="Detailed" existingResponse="PassThrough">
		</httpErrors>
	</system.webServer>
</configuration>

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