Is it okay to only use the cookie once in atc()?

[andrewshi98]

I was checking out a code and found out that the cookie provided in sensor_data_cookie.txt seems to be only used once. Afterward the session only adopts whatever set cookie is sent to it. The webpage will send an _abck back to the client, though I suspect that some other parameters that might be important will be missing in the proceeding calls (such as SID, vt). Is it okay to not set the cookie beforehand and only use it on the first request?