A modern programming language that makes developers happier.

kotlinlang

You want to use this function: <https://github.com/varabyte/kobweb/blob/17e25243da037a2c3373cca33969ea97175974a4/frontend/kobweb-core/src/jsMain/kotlin/com/varabyte/kobweb/navigation/Router.kt#L262|https://github.com/varabyte/kobweb/blob/17e25243da037a2c3373cca33969ea97175974a4/frontend/kobweb-core/src/jsMain/kotlin/com/varabyte/kobweb/navigation/Router.kt#L262>

I should really add some header docs for that

But you can call that inside an @InitKobweb block.

The method I linked to basically accepts a composable method with a single int value representing the error code (but that currently is always just 404)