How to organize the display of two different versions of the site on the same domain with alternation?

Question

contextual advertising

Hello.
There is a working site. Made a new version. We want to test which site will work better. We know from experience that direct works better for us, so it is Direct that interests us for the experiment ...
I would like that if the site is opened by 100 people, then half will see one version of the site, and the other half the other. Subdomains and other domains do not want to use.

Answer 1

Add a variable to the session to the user and check it before showing it

Answer 2

It's just A/B testing. For example, using Google Analytics experiments .