Azure Websites Paas offering from Microsoft gives you more power to you. You could change a few default configurations that come with the platform by various means, for example, for PHP you can set a few settings in .user.ini, for any custom values for ApplicationHost.config, you can use XDT transforms. There are a lot of times, you want to check what are the default configuration files that are used for your Azure Website. You could easily get those files from the Kudu Console. To access the Kudu Console, navigate to https://yoursite.scm.azurewebsites.net, and login with your deployment credentials.

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