Detecting a “unique” anonymous user

Question

It is impossible to identify a user or request as unique since duping is trivial.

However, there are a handful of methods that

Answer 1

Yes, it's impossible to tell anonymous visitors apart with 100% certainty. The best that you can do is to gather the information that you have, and try to tell as many visitors apart as you can.

There is one more piece of infomration that you can use:

1. Browser string
   • It's not unique, but in combination with the other information it increases the resolution.

If you need to tell the visitors apart with 100% certainty, then you need to make them log in.