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kotlinlang

Hi there, how to ignore `null` values from HTTP post body

Can you share example json?
If you mean you dont want to deserialize some fields that you dont care you can use
```install(ContentNegotiation) {
    json(
        Json {
            ignoreUnknownKeys = true
        },
    )
}```


```import kotlinx.serialization.SerialName
import kotlinx.serialization.Serializable

@Serializable
data class LoginRequestBody(
    @SerialName("name")
    val name: String,
    @SerialName("last_name")
    val lastName: String?=null,
    @SerialName("password")
    val password: String?=null
)```

```suspend fun postLogin(loginBody: LoginRequestBody): HttpResponse {
    return httpClient.post("url") {
        contentType(ContentType.Application.Json)
        setBody(loginBody)
    }
}```
In this above code I don't want to post the key `lastName` to http post request, because it can be `null` .

Whenever `lastName` is null I want to _*ignore*_ in post `requestbody`

I want to have something like

@JsonInclude(Include.NON_NULL)
<https://www.javaguides.net/2019/04/jackson-ignore-null-and-empty-fields-on-serialization.html>

```val r = LoginRequestBody("Test")
val x = Json.encodeToString(r)
println(x)```
default behavior will be
```{"name":"Test"}```