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How do one use the HttpClient MockEngine when JsonFeature is expected on the engine? Is there any way without having to do the (de)serializing manually? See example failing test. (On Ktor 0.9.4)

It looks like you try to set `contentType` header by hand. It's forbidden.

It looks like you could set `Accept` header to `ContentType.Application.Json` in `fetchData` and drop `contentType()` setup

But the `contentType(ContentType.Application.Json)` is needed for the `JsonFeature` to kick in. Removing it (or replacing with Accept header) will cause a ClassCastException since `body` is not a `OutgoingContent`

btw: Where did you install `JsonFeature`?

Yep. We should create OutgoingContent with proper content type here.

Production code has (excerpt):
```
HttpClient(Apache) {
  install(JsonFeature) {
    serializer = JacksonSerializer()
  }
}
```

Could you try to set this workaround as body?
```
object Json : OutgoingContent.NoContent() {
    override val contentType: ContentType get() = ContentType.Application.Json
}
```
Would be nice if you file an github issue. It's an API problem and I'll try to fix it asap.

Sure, I'll file a github issue. :slightly_smiling_face:

<https://github.com/ktorio/ktor/issues/615>

That leads to another problem which I didn't think of; the MockEngine of course does not know how to transform `MockHttpResponse` into `MyResponse` data class :thinking_face:

You could try to make the converting interceptor :slightly_smiling_face: