The WSDL is visible in a browser by using the URL https://ServerAddress/4DWSDL. One thing to note is that not all browsers render the WSDL the same. For example, when trying to view the WSDL in Safari, it renders it as a blank page. Whereas Firefox, Chrome and Internet Explorer all display the WSDL correctly.

The WSDL can be viewed in Safari by choosing the "View Source" menu item in the contextual menu.