Convert HttpURLConnection to Curl Command in Kotlin

toCurl.kt

fun toCurl(connection: HttpURLConnection, body: ByteArray): String {
        var builder = "curl -v "

        builder += "-X " + connection.requestMethod + " \\\n  "

        for (entry in connection.requestProperties) {
            builder += "-H \"" + entry.key + ":"
            for (value in entry.value)
                builder += " $value"

            builder += "\" \\\n  "
        }

        if (body.isNotEmpty())
            builder += "-d '" + String(body) + "' \\\n  "

        builder += "\"" + connection.url + "\""

        return builder
    }