As a service 1whois.ru specifies the server type, version?

Hi. There is such a service 1whois.ru which shows different information domain. Among others, it sometimes shows server type (nginx, IIS) , version (here as a language or framework), and sometimes even shows CMS . Everything checked out accurately identified. For example, for one of my site with node/express determined version = express. Question: how do you identify those data?
June 27th 19 at 15:08
1 answer
June 27th 19 at 15:10
The server type is transmitted in each response from the server when you visit a website.
CMS and peculiarities of their measurement depend on the cms. Some at the admin, some folders in the pictures for example, some in code written in plain text, etc. Version of it is often on the written page admin, or have xcrf vulnerability showing for more info.

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