Application.kt

private val client = HttpClient(OkHttp) {
    install(JsonFeature) {
        serializer = GsonSerializer()
    }
    install(HttpTimeout) {
        requestTimeoutMillis = 30_000
    }
    install(Logging) {
        logger = Logger.DEFAULT
        level = LogLevel.ALL
    }
    engine {
        config {
            followRedirects(true)
            followSslRedirects(true)
            connectTimeout(30, TimeUnit.SECONDS)
            readTimeout(30, TimeUnit.SECONDS)
            writeTimeout(30, TimeUnit.SECONDS)
        }
    }
}

fun Application.module(testing: Boolean = false) {
  
  routing {
        post("/a/route") {
          call.respond(HttpStatusCodes.OK)
          
          val urlResponse = withContext(Dispatchers.IO) {
            client.post("url") { body = someBodyHere }
          }
          
          val urlResponse2 = withContext(Dispatchers.IO) {
            client.post("url2") { body = urlResponse.something.from.first.call }
          }
        }
  }
}