Make post request in python, bypassing server detection

Okay so I am trying to submit a form using a python script. I realized that I need use the server cookie, and two other fields and then send the request. My traffic script's traffic headers and body look exactly the same as the one I get from my browser. Yet, I get a status code 400 after I send the request. I would be glad if someone experienced can take a look at my code and help.