this post was submitted on 27 Nov 2023
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What do you mean?
How does it know what part of the link is the site tracking?
Looks like it has a list of global and site specific parameters that it is safe to remove.
Generally, most are variables prefixed with
utm_
They likely built an index from most of the Analytics services also.
I think it's a combination of things, a basic approach of removing the query string (after the question mark) with exceptions for different sites that might need some of the query string.