Have you used the Ktor framework for developing applications in Kotlin?

Yes, Ktor is an asynchronous framework in Kotlin for building server and client applications. It is convenient for developing REST APIs, web applications, and microservices due to its lightweight and flexible nature. For example, you can quickly set up an HTTP server with routing and request handling:

import io.ktor.application.*
import io.ktor.http.*
import io.ktor.response.*
import io.ktor.routing.*
import io.ktor.server.engine.*
import io.ktor.server.netty.*

fun main() {
    embeddedServer(Netty, port = 8080) {
        routing {
            get("/") {
                call.respondText("Hello, Ktor!", ContentType.Text.Plain)
            }
        }
    }.start(wait = true)
}

Ktor also makes it easy to configure client requests, handle JSON, work with sessions, and authentication.