import io.ktor.server.application.*
import io.ktor.server.cio.*
import io.ktor.server.engine.*
import io.ktor.server.response.*
import io.ktor.server.routing.*

fun main(args: Array<String>) {

  val helloWorldResponse = args.firstOrNull()
    ?: error("missing arg")

  val env = applicationEngineEnvironment {
    envConfig(helloWorldResponse)
  }
  embeddedServer(CIO, env).start(true)
}

fun ApplicationEngineEnvironmentBuilder.envConfig(helloWorldResponse: String) {
  module {
    routing(helloWorldResponse)
  }
  connector {
    host = "0.0.0.0"
    port = 8080
  }
}

fun Application.routing(helloWorldResponse: String) {
  routing {
    get("/module1") {
      call.respondText(helloWorldResponse)
    }
  }
}