See issue raised initialy on spring-boot: https://github.com/spring-projects/spring-boot/issues/10756
Jackson2SmileEncoder/Decoder declare "stream+x-jackson-smile" as a streaming MediaType, it doesn't seem to work by default. In my use case, we need binary encoding as we pass a lot a matrices and json just doesn't perform well for that case. CBOR would also be nice, if it came with a streaming option.
I've attached a new sample project.