The most common is using an HTTP header. Less common: `document.location` in JavaScript
https://developer.mozilla.org/en-US/docs/Web/HTTP/Redirectio...
https://developer.mozilla.org/en-US/docs/Web/HTTP/Redirectio...
And document.location is pointless if the client has turned off scripting.
A) “how do people redirect”, to which the point about noscript sounds like irrelevant whining
B) “how do people redirect only visitors who don’t have scripting” to which most of the answers are trivially wrong