It's more idiomatic to call

client.use { ... }

instead of

client.also { ... }

. That will call

close()

automatically.

It's not the point, why client closes automatically in 1.1.1, and required to be closed in 1.2.1. Looks like

close

method not calling on

Engine

in both version, code which create AsyncHttpClient is the same. I have no idea what to check also

Client holds

runBlocking

if some connection is still active. Probably the validate method doesn’t close the response.

fun main() {
    val client = AppStoreClient("...", "...")

    runBlocking {
        println(client.validate("..."))
    }

    println("Done")
}

In this case

Done

will be printed, but JVM: 1. ktor-client:1.1.1 - stopped 2. ktor-client 1.2.1 - keep running