Consume Spring Flux by Retrofit Observable/Flowable - retrofit2

Question

Is it possible to consume Flux endpoint as Observable or Flowable in Retrofit?
What I am aiming to achieve is to emit items from endpoint to the consumer.
Spring boot WebFlux endpoint
#RestController
#RequestMapping("user")
class UserController {
private val repo = listOf(
UserDoc().apply {
id = 1
name = "test1"
createdAt = LocalDateTime.now()
},
UserDoc().apply {
id = 2
name = "test2"
createdAt = LocalDateTime.now()
},
UserDoc().apply {
id = 3
name = "test3"
createdAt = LocalDateTime.now()
}
)
#GetMapping
fun findAll(): Flux<UserDoc> = Flux.just(*repo.toTypedArray())
}
Sample response
[
{
"id": 1,
"name": "test1",
"createdAt": "2022-10-04T15:25:34.540953"
},
{
"id": 2,
"name": "test2",
"createdAt": "2022-10-04T15:25:34.540976"
},
{
"id": 3,
"name": "test3",
"createdAt": "2022-10-04T15:25:34.54098"
}
]
Retrofit client
fun main() {
val userApi = Retrofit.Builder()
.addCallAdapterFactory(RxJava2CallAdapterFactory.createWithScheduler(Schedulers.io()))
.addConverterFactory(GsonConverterFactory.create())
.baseUrl("http://localhost:2020/")
.client(OkHttpClient())
.build()
.create(UserApi::class.java)
val compositeDisposable = CompositeDisposable()
compositeDisposable.add(
userApi.findAll()
.subscribeOn(Schedulers.io())
.subscribe {user: User ->
println(user)
}
)
Thread.currentThread().join()
}
interface UserApi {
#GET("user")
fun findAll(): Flowable<User>
}
data class User(
val id: Long,
val name: String
)
The current implementation return this error:
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
If I change the Flowable<User> to Flowable<List<User>> it's works fine.
Is it possible to subscribe the list user by user? or create WebSocket and create my custom Observable?