The last few server-side languages I've used don't use extensions or publish a header banner. In many cases it's just not possible to tell what's running. w3te

The last few server-side languages I've used don't use extensions or publish a header banner. In many cases it's just not possible to tell what's running. w3techs admit as much in their disclaimer. The data and conclusions from it are junk. > In order to obtain any information from websites, we rely on the websites themselves, their owners or their webmasters to provide such information. Some websites are more open to sharing this type of information than others. Some technologies may provide more means to reveal information about their usage than others.