Show different things based on user agent

[Noah_S]

Is there a way to check the user agent and if it's, let's say GPTBot, show it an error page instead of the actual page?

My host supports PHP.

[Rubbereon]

I downloaded this last year, but ended up not even using it.
https://rafael.adm.br/css_browser_selector/

Despite the name it does pretty much what you want because it detects the operating system and browser of the user.

The problem is that Linux's default fonts are different from Windows yeah right this is obvious! I mean my website (at least the homepage) is themed around classic Windows, so it'd be a bit of an issue if Linux uses Noto Sans instead of Times New Roman, but even then I kind of forgot about it and am thinking of a way to solve this issue with css only in case somebody runs noscript which would break the whole setup.

I think javascript is required though, so may wanna make a default page with <noscript> tags in case the javascript breaks.

[Rubbereon]

GPTBot

Ah also GPTbots can't run javascript nor css at all, so you could show them a blank page while your regular users could see your webpage as normal, but I am getting off-topic.

If you have php I presume you have an .htaccess file too, you can block the bot by blacklisting its useragent, there's a website that even details everything you need to know about that.
https://perishablepress.com/ultimate-htaccess-blacklist/

[Seechain]

If you have php I presume you have an .htaccess file too, you can block the bot by blacklisting its useragent, there's a website that even details everything you need to know about that.
https://perishablepress.com/ultimate-htaccess-blacklist/

  I read .htaccess and a lot of memories got unlocked for me, you can do a lot of tricks with that file, for example redirecting to the mobile version of a site based on the user agent, so I think it would work the same for a bot.