Why do I often see ktor apps with the routing module using `install(Routing)` and others just declar...

# ktor

[Nick Halase]

Why do I often see ktor apps with the routing module using install(Routing) and others just declare routing directly? Is the install for the routing module really optional?

[Sebastian Owodzin]

This is why https://github.com/ktorio/ktor/blob/main/ktor-server/ktor-server-core/jvmAndNix/src/io/ktor/server/routing/Routing.kt#L145-L147

Basically the first time you use

routing {
    ...
}

it will install the plugin if it wasn’t installed already.