@orangy yes, thanks. Any plans to add such

ContentConverter

as maven artifact similar to jackson one in the future?

Is there any evidence that protobuf is frequently used like this?

like serialization format for client-server communication without using grpc?

Nope, as a content type format for direct web requests. As far as I understand, it’s mostly used for some longer running connections, like Web Sockets or direct TCP connection, but I may be missing some important use case.

It is quite common usecase to migrate from Json to Proto in mobile projects in case of large amount of small objects passing to requests/responses. The reasons are simple - improved parsing performance, lower CPU usage than gson/jackson, fixed protocol, api versioning etc.