now I got something like this ( Accept-Language: en-US,en;q=0.5

Accept-Encoding: gzip, deflate

Connection: keep-alive

Accept: */*

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0

Host: detectportal.firefox.com

Pragma: no-cache

Cache-Control: no-cache

)