Hi. Developing multiplatform library for Android a...

# ktor

[rsetkus]

Hi. Developing multiplatform library for Android and iOS. At the moment don't need anything specific for Android so targeting jvm and iOS. Getting an error on Android application when making a Ktor request call. By the way, I don't get a such error on unit test at commonMain module which runs against jvm. Any ideas what can cause this error?

io.ktor.client.call.NoTransformationFoundException: No transformation found: class io.ktor.utils.io.ByteChannelKt$ByteChannel$1 (Kotlin reflection is not available) -> class xxx.YYY (Kotlin reflection is not available)
    with response from <https://XXX>:
    status: 200 OK
    response headers: 
    cache-control: max-age=600
    , connection: keep-alive
    , content-type: application/json;charset=utf-8
    
        at io.ktor.client.call.HttpClientCall.receive(HttpClientCall.kt:84)

[louiscad]

I'd try to use the CIO or OkHttp engine on the JVM and Android. The default engine used on the JVM probably fails on Android for some reason.

[rsetkus]

Should be something else. Pulling Android engine for jvm io.ktor:ktor-client-android

[louiscad]

FYI, the Android engine is quite barbones. I'd use OkHttp or CIO over it anyday.

[rsetkus]

Not sure how it is related but changing from

request<R>(path) {
    this.method = methodType
    this.headers.appendAll(headersSupplier())
    this.body = body
}

to

val response = get<String>(path) {
    this.headers.appendAll(headersSupplier())
}

Json.decodeFromString(R::class.serializer(), response)

serializes from string to type R

[rsetkus]

Hmm... I can see that default serialization engine for Ktor is Gson. Maybe this is it 🤔

[louiscad]

Ah yes, you need to explicity setup the Json feature.

[rsetkus]

Any reason I cannot access (not visible, cannot import...) JsonFeature on common module? Do I need to include explicit dependency for it? Already included "org.jetbrains.kotlinx:kotlinx-serialization-json:1.0.0"

[rsetkus]

No worries. Sorted. Where Missing io.ktor:ktor-client-json and io.ktor:ktor-client-serialization.

I find it quite hard to get around in Ktor docs. Found it on somebody's github.

[louiscad]

Yep, the docs for the clients are not as good as the docs for the server. But the ktor team expanded, and they are working on docs improvements, among other things.