It depends on the defences. It starts trivial - just make a http request. Then there's http version, user agent header, other headers, header ordering, cookies,

It depends on the defences. It starts trivial - just make a http request. Then there's http version, user agent header, other headers, header ordering, cookies, TLS ciphers, session resolution, timing, behaviour for page resources, ... and so many other things. It takes time, even if you order headless chrome.