Add JSON support to Protobuf codecs

[anborg]

Use case: Developers want to create Protobuf service implementation, more efficient. However, also need to expose as rest/json, to support clients that consume json -- perhaps we are in technology-transition time?

This does not work for netty/webflux, but works for tomcat, so likely some platform config issue?

Please make it easy to expose PROTO implementation as rest, without code duplication.

https://stackoverflow.com/questions/60289736/spring-webflux-netty-no-tomcat-how-to-expose-proto-as-json-endopints-without/63022169#63022169

[bucknerns]

+1

[sdeleuze]

Protobuf support is provided in Spring WebFlux via ProtobufDecoder and ProtobufEncoder. Could you please check what prevents you to use that support?

[bucknerns]

Json serialization/deserialization doesn't work for protobufs when using webflux.

[sdeleuze]

Ok I understand now, so this is about providing similar capablities than ProtobufJsonFormatHttpMessageConverter bu on codecs/WebFlux side.