Hi all .. I have been getting this 404 error response when trying to return a serialized data class using kotlin serialization.

"Skipping response body transformation from HttpStatusCode to OutgoingContent for the POST /register request because the HttpStatusCode type is ignored. See [ContentNegotiationConfig::ignoreType]". Anyone knows how I can go about it? I have tried searching online first.

This is how I am installing content negotiation.

fun Application.configureSerialization() {
    install(ContentNegotiation) {
        json()
    }
}

Can you share the code for responding with a data class?

This is the route for registering a user

post("/register") {
    val userFromClient = call.receive<User>()
    authenticationBusiness.registerUser(user = userFromClient).collect { registrationResult ->
        when (registrationResult) {
            is OperationResult.Success -> {
                call.respond(status = HttpStatusCode.Created, message =registrationResult.data)
            }

            is OperationResult.Failure -> {
                call.respond(status = HttpStatusCode.Conflict, message = "Unable to register user")
            }
        }
    }
}

registrationResult.data results in an AccessModel class as shown here

@Serializable
data class AccessModel(
    val accessToken: String,
    val refreshToken: String,
    val expiresIn: String
)

This one here is the User model

@Serializable
data class User(
    val id: Int,
    val streetName: String,
    val password: String,
    val phoneNumber: String,
    val isPlayer: Boolean
)

So a

/register

POST request results in the 404 status code?

@Aleksei Tirman [JB] Yeah . The

/register

POST request does result in the 404 error.

Can you check that the handler for the route is actually executed?