Hi. How can I write a CLIENT PLUGIN that can read ...

# ktor

[Jakub Gwóźdź]

Hi. How can I write a CLIENT PLUGIN that can read response body twice?
I need the normal functionality, like val dummies : List<Dummy> = client.get().body() but I also need the body as text (before any deserialization) for auditing purposes.
The best solution I found is using the ResponseObserver and inside reading response.content.readRemaining().readText(…) but it uses InternalApi that I need to OptIn, hardly a civilised solution

Also I’d prefer to do the same in Plugin instead of ResponseObserver…

[Aleksei Tirman [JB]]

You can, but the double body receiving works only since Ktor 3.0.0 (3.0.0-eap-800). Here is an example:

val plug = createClientPlugin("myplug") {
    onResponse { response ->
        println("Response body: ${response.bodyAsText()}")
    }
}

suspend fun main() {
    val client = HttpClient(OkHttp) {
        install(plug)
        install(ContentNegotiation) {
            json(Json {
                ignoreUnknownKeys = true
            })
        }
    }

    val response = <http://client.post|client.post>("<https://httpbin.org/post>").body<HttpBin>()
    println(response.origin)
}

@Serializable
data class HttpBin(val origin: String)

[Jakub Gwóźdź]

That’s great to know, thanks!