Would you like to display detailed error messages in IIS?
You can easily enable this yourself in the web.config file.
Just add the following line inside the <system.webServer> tag:
<httpErrors errorMode="Detailed"/>
If the web.config file does not yet exist, you need to create it first.
Example of a new configuration file:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<httpErrors errorMode="Detailed"/>
</system.webServer>
</configuration>
Important note:
Once this option is enabled, you can no longer define custom HTTP error messages.
This function is only available on Windows / IIS.