favicon.kt

// implementation of favicon interceptor

public class FavIconInterceptor(val icon: String): Interceptor {

    override fun intercept(request: Request, response: Response): Boolean {
        if (request.method == HttpMethod.GET && request.uri.compareToIgnoreCase("/favicon.ico") == 0) {
            response.streamFile(icon, "image/x-icon")
            return true
        }
        return false
    }

}

// optional extension method for easier usage
fun AppServer.favicon(icon: String) {
    intercept(FavIconInterceptor(icon))
}

// usage

val server = AppServer()

server.favicon("/public/icon.ico")