: What is the best strategy for tracking USER ID on a website without login system? Considering a brand new feature of USER ID in Google Universal Analytics I’m wondering what is the best model

@Shakeerah822

To me there's two major ways to track users without a session: first a cookie and second HTTP headers.
A cookie is great if you'd like to get any request -- even images, CSS, etc. The bad thing here is that this overhead will be carried on every request about 30 to 100 times per site visited in non-SPA-sites. It's tiny but it start's bothering you when scaling up users.
The second approach is using HTTP headers -- which requires JavaScript to modify and is only applicable to SingePage-Applications (SPA).

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