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kotlinlang

Hello everyone,

Im getting No such element exception - List is empty when changing the configuration of HttpClient in iOS.

client = HttpClient().config {
                expectSuccess = false
                install(JsonFeature) {
                    serializer = defaultSerializer()
                }
            }

I just tried this code and it worked fine.
i'm using `ktor-client-okhttp` and `ktor-client-gson` on the JVM, maybe your problem comes specifically from the `ktor-client-ios` implementation.

i dont have any problems when running on jvm either

Hi <@UH18YCZK3>, it’s the known problem. There is no reflection in `kotlin-native` and you have to call `register` method on `KotlinxSerializer` explicitly for now :disappointed:

thats interesting, I must be doing something wrong as I cant reference KotlinxSerializer()

<https://ktor.io/clients/http-client/features/json-feature.html>

`commonMain {`
`            dependencies {`
`                implementation "io.ktor:ktor-client-json:$ktor_version"`
`                implementation kotlin('stdlib-common')`
`                implementation "io.ktor:ktor-client-core:$ktor_version"`
`                implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core-common:1.3.0-M2'`
`                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:0.11.1"`
`            }`
`        }`
`        commonTest {`
`            dependencies {`
`                implementation kotlin('test-common')`
`                implementation kotlin('test-annotations-common')`
`            }`
`        }`
`        jvmMain {`
`            dependencies {`
`                implementation kotlin('stdlib')`
`                implementation "io.ktor:ktor-client-android:$ktor_version"`
`                implementation "io.ktor:ktor-client-json-jvm:$ktor_version"`
`                implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.0-M2'`
`                `
`                implementation 'org.jetbrains.kotlinx:kotlinx-serialization-runtime:0.11.1'`
`                implementation "io.ktor:ktor-client-serialization-jvm:$ktor_version"`
`                `
`            }`
`        }`
`        jvmTest {`
`            dependencies {`
`                implementation kotlin('test')`
`                implementation kotlin('test-junit')`
`            }`
`        }`
`        iosMain {`
`            dependencies {`
`                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-native:$serializer_version"`
`                implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core-native:$coroutine_version"`

`                implementation "io.ktor:ktor-client-ios:$ktor_version"`
`                implementation "io.ktor:ktor-client-core-native:$ktor_version"`
`                implementation "io.ktor:ktor-client-json-native:$ktor_version"`
`                implementation "io.ktor:ktor-client-serialization-native:$ktor_version"`
`            }`
`        }`
`        iosTest {`
`        }`

Could you create a gist(<https://gist.github.com>)?

build.gradle

It looks like `"io.ktor:ktor-client-serialization:$ktor_version"` is missing in `commonMain`. It would be easier to config with gradle metadata enabled.

Sorry to bother you again but I'm getting this error kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen exceptions.ErrorResponse@81a0fbd8

Error response is a @Serializable data class

the error occurs at HttpResponse.receive&lt;ErrorResponse&gt;