Hi everyone, help needed for WebSocket server in K...

# ktor

[Aleksandar Ilic]

Hi everyone, help needed for WebSocket server in Ktor. Any experts here?

I have this code from Ktor github code sample:

fun main(args: Array<String>) {
    runBlocking {
        val selectorManager = SelectorManager(<http://Dispatchers.IO|Dispatchers.IO>)
        val serverSocket = aSocket(selectorManager).tcp().bind("127.0.0.1", 9002)
        println("Server is listening at ${serverSocket.localAddress}")
        while (true) {
            val socket = serverSocket.accept()
            println("Accepted $socket")
            launch {
                val receiveChannel = socket.openReadChannel()
                val sendChannel = socket.openWriteChannel(autoFlush = true)
                sendChannel.writeStringUtf8("Please enter your name\n")
                try {
                    while (true) {
                        val name = receiveChannel.readUTF8Line()
                        sendChannel.writeStringUtf8("Hello, $name!\n")
                    }
                } catch (e: Throwable) {
                    socket.close()
                }
            }
        }
    }
}

But when I try to connect it to it from Postman on <wss://127.0.0.1:9002> I’m getting

Error: write EPROTO 140509838351224:error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER:../../../../src/third_party/boringssl/src/ssl/tls_record.cc:242:

Any help really appreciated. Thanks!

[Aleksei Tirman [JB]]

This code starts a server that listens to TCP/IP connections. Here you can find a WebSockets server example.

[Aleksandar Ilic]

Thanks! I changed the implementation and I’m still getting the same error. The server is run at 0.0.0.0:8080 and I’m connecting to wss:\\0.0.0.0:8080\echo with Postman when I get the error.

Maybe my computer is missing some libs.

[Aleksandar Ilic]

I should have used ws:\\0.0.0.0:8080\echo instead since there is no SSL configured. Thanks @Aleksei Tirman [JB] again for pointing in right direction.