How to prevent a user from accessing the site if he has a mobile OC?

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  Here I have a site, and if a user comes to it from Android or IOS (from a mobile system of some kind), then I would like the user to be automatically redirected to the site page where it says: "Oops .... you cannot use our site .... here is a link to another version of our site for mobile devices: * link * ". Please tell me how this can be implemented in JavaScript?

  JavaScript Theodore Scott, Jul 17, 2020

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1 Answers
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  This is determined by the User-Agent header in the HTTP request received from the client when he visited the site.
  
  P.S. Change the difficulty of the question to easy

  Anonymous

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