In webscraping and saving request header information should I be concerned about them changing/breaking the script?

Question

I am creating a script to scrape data off of a website (POST request) and these are the header information I'm saving to make the script work.

headers = {
    'User-Agent': "",
    'Accept': "",
    'Accept-Language': "",
    'Accept-Encoding': "",
    'Referer': "",
    'Content-Type': "",
    'Access-Control-Allow-Methods': "",
    'Access-Control-Allow-Origin': "",
    'Access-Control-Allow-Headers': "",
    'Cache-Control': "",
    'Pragma': "",
    'Expires': "",
    'X-Frame-Options': "",
    'X-Content-Type-Options': "",
    'env': "",
    'type': "",
    'token': "",
    'clientId': "",
    'Origin': "",
    'DNT': "",
    'Connection': "",
    'Sec-Fetch-Dest': "",
    'Sec-Fetch-Mode': "",
    'Sec-Fetch-Site': "",
    'TE': ""
    }

1. Is [token] based on session, hardware, or what?

2. Should I be concerned about the information in headers to change and breaking the script or can I safely set and forget?

Thank you.