import java.io.*

import java.net.HttpURLConnection

import java.net.URL

​

fun main() {

    val url = URL("http://httpbin.org/post")

    val json = """{"name":"John Doe", "age": 30}"""

    val connection = url.openConnection() as HttpURLConnection

    connection.apply {

        requestMethod = "POST"

        doOutput = true

        setRequestProperty("Content-Type", "application/json")

    }

​

    val outputStream = connection.outputStream

    outputStream.write(json.toByteArray())

    outputStream.flush()

    outputStream.close()

​

    val response = connection.inputStream.use { it.reader().use { reader -> reader.readText() } }

    println(response)

    connection.disconnect()

}