I'm getting a really strange exception using ktor-...

# ktor

[Daniel Pitts]

I'm getting a really strange exception using ktor-client 3.2.3 with SSE.

Caused by: kotlinx.serialization.SerializationException: Serializer for class 'ClientSSESession' is not found.

For some reason, the private suspend inline fun <reified T> HttpClient.processSession method is trying to create a body of type ClientSSESession, which seems wrong to me, but i don't really know.

statement.body<T, Unit> { session ->
    sessionDeferred.complete(session)
}

[Daniel Pitts]

My HttpClient configuration is:

defaultRequest {
            url(baseUrl)
            bearerAuth(apiKey)
            contentType(ContentType.Application.Json)
        }

        install(ContentNegotiation) {
            json(json)
        }

        install(SSE) {

[Daniel Pitts]

Okay, I found a solution (kind of). I had a mistake in my request (method needed to be set to post). So the server responded with 400 Bad Request. For some reason, that caused ktor client to try to deserialize the response body as the ClientSSESession, which is not the correct behavior IMO. I don't see any obvious place to intercept response failures before the SSE kicks in.

[Aleksei Tirman [JB]]

Can you please share a complete code snippet to reproduce the problem?

[Daniel Pitts]

I'll see if I can create a unit test that does...

[Daniel Pitts]

Here is a unit test that shows the issue.

SseContentNegotiationErrorReproducerTest.kt.cpp

[Aleksei Tirman [JB]]

Thank you for the code snippet. I've added your test to the respective issue.