How does ktor serialize `body`, which is of type `...

# ktor

[Sourabh Rawat]

How does ktor serialize body, which is of type Any ?
When I do something like this, it fails..

@Serializable
class Foo(val bar: String)

@Test
fun test() {
    val any: Any = Foo("asd")
    Json.encodeToString(any).also { println(it) }
}

[Aleksei Tirman [JB]]

Could you please share a code with Ktor involved?

[Sourabh Rawat]

private suspend inline fun <reified V> MethodData.call(): V {
        return <http://httpClient.post|httpClient.post> {
            url(endpoint(token, id))
            contentType(ContentType.Application.Json)
            body = this@call
        }
    }

above has body type of Any
MethodData is interface.
I call call method on subclasses of MethodData but in the scope of call it is denoted by MethodData. I believe same thing is happening in my above code. But it is failing for my code, where as ktor is able to encode the body.

[Aleksei Tirman [JB]]

There is a method HttpClient.defaultTransformers that creates an instance of OutgoingContent object depending on a body's actual type.

[Sourabh Rawat]

Won’t it evaluate to content = null since ContentType is neither Plain/ByteArray/ByteReadChannel ?

[Aleksei Tirman [JB]]

If you have the JsonFeature installed then it will return TextContent object earlier (a serializer will be determined on this line).

[Sourabh Rawat]

Ah I see. Now I get it. Thanks a lot!