Kotlin port of the solution proposed by @naderghanabri: http://stackoverflow.com/a/28787883/4568679

SSL.kt

import java.security.SecureRandom
import java.security.cert.X509Certificate
import javax.net.ssl.*

object SSL {

	fun trustAll() {
		val sslContext = SSLContext.getInstance("SSL")
		sslContext.init(null, arrayOf(TrustAll), SecureRandom())
		HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.socketFactory)
		HttpsURLConnection.setDefaultHostnameVerifier(VerifyAllHostnames)
	}

	private object TrustAll : X509TrustManager {
		override fun getAcceptedIssuers() = null
		override fun checkClientTrusted(x509Certificates: Array<X509Certificate>, s: String) {}
		override fun checkServerTrusted(x509Certificates: Array<X509Certificate>, s: String) {}
	}

	private object VerifyAllHostnames : HostnameVerifier {
		override fun verify(s: String, sslSession: SSLSession) = true
	}
}