android - How to HTTP request by POST method with Kotlin

I'm new a kotlin dev. please teach me to use httpRequest in Kotlin.

Question
- If I want to request to API service and I must to send request body with json object by use post method, How I write??

Thank for help.

Answer

You can write your data using outputStream.write(postData).

 fun pushToChat(message: String) {

        val serverURL: String = "your URL"
        val url = URL(serverURL)
        val connection = url.openConnection() as HttpURLConnection
        connection.requestMethod = "POST"
        connection.connectTimeout = 300000
        connection.connectTimeout = 300000
        connection.doOutput = true


        val postData: ByteArray = message.toByteArray(StandardCharsets.UTF_8)

        connection.setRequestProperty("charset", "utf-8")
        connection.setRequestProperty("Content-lenght", postData.size.toString())
        connection.setRequestProperty("Content-Type", "application/json")

        try {
            val outputStream: DataOutputStream = DataOutputStream(connection.outputStream)
            outputStream.write(postData)

            outputStream.flush()
        } catch (exception: Exception) {

        }

        if (connection.responseCode != HttpURLConnection.HTTP_OK && connection.responseCode != HttpURLConnection.HTTP_CREATED) {
            try {


                val reader: BufferedReader = BufferedReader(InputStreamReader(inputStream))

                val output: String = reader.readLine()

                println("There was error while connecting the chat $output")
                System.exit(0)

            } catch (exception: Exception) {
                throw Exception("Exception while push the notification  $exception.message")
            }
        }


    }