fun Route.localPort(
    port: Int,
    build: Route.() -> Unit
): Route

Create a route to match the port on which the call was received.

The selector checks the io.ktor.request.ApplicationRequest.local request port, ignoring HTTP headers such as “Host” or “X-Forwarded-Host”. This is useful for securing routes under separate ports.

For multi-tenant applications, you may want to use io.ktor.routing.port, which takes HTTP headers into consideration.


port - the port to match against


IllegalArgumentException - if the port is outside the range of TCP/UDP ports