Are global variables shared between all HTTP requests?

Hello Community,

 

Does each http request have it's own global variable or do they share one global variable?

 

Example)

 

HTTP Request 1 comes in and set's a global variable to "ABC"

 

HTTP Request 2 comes in and set's the global variable to "ZAC" before HTTP Request 1 finishes.

 

Is HTTP Request 1 global variable still "ABC" or is it "ZAC"?

 

Hope this make sense.

 

Thanks in advance.

 

Regards,

 

TRX