How to generate a unique value for the variable that will persist between requests?

[Mirodil]

Hello,

How can I generate a unique value for the variable foo that will persist between requests? For example, I want to send @foo and have foo persist value for each request. Is it possible to generate a unique value for a global variable or for each session?

@bar={{$uuid}}
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@foo=foo{{bar}}
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GET https://httpbin.org/anything?foo={{foo}}
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GET https://httpbin.org/anything?foo={{foo}}