How to get the request token?

Question

Python

Good day
How to find out the secret key for the successful completion of the request?
I read that the server compares the keys of the client and the server, if it does not converge, then the request error
Where to look for this key on the client side?
When I send a form for processing in the browser (I send a message, for example), something like
00e81391=b5221485b3bc7ed7161da4258955538c17cc05a4
&2c7a3706=c5585db8 &
form_sent=1
&form_user=user
&files%5B%5D=
&req%EA=%EA is written in the headers
most likely the second) are the result of generation (they are the same keys)

Answer 1

1. cookies
2. hidden fields in the page code