- Different content must be shown to user depending on the test scenario
- Percentage of audience we want to send test to
- Write the correspondent variant - for one cookie we want to send the same variant
- if user receive variant A - I will part of a/b testing
- if a user is not part of the test, if he goes to the normal traffic = he won't be part of a/b testing (cookie)
- Different strategy of dispatcher: evenly, adaptive and weighted distribution
- Variant cache: store the shown variant to the user (somewhere) and directly show from there
- CDN will always understand there is one page (same URL) = cache URL and cookie
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