Spring Feign and JSON-RPC

One day I was wondering if I can use Spring Feign client to work with to JSON-RPC server...

Description

The project consist of two modules: client and server. JSON-RPC protocol is used for communication.

Problem

Default implementation of JSON-RPC service is that 'Content-Type' http header would be 'application/json-rpc', but Feign by default not support this type. To solve this there're two options:

• (on cleint) Create your own implementation of Decoder interface. Using MappingJackson2HttpMessageConverter object you can redefine supportedMediaTypes prop.
• (on server) Redefine 'Content-Type' via AutoJsonRpcServiceImplExporter object.

Both ways were implemented (last one commented out).

Request example

To test services work you can run test on client service or run this curl:

curl \
    -u user:password \
    -H "Content-Type:application/json" \
    -d '{"id":"1","jsonrpc":"2.0","method":"multiplier","params":{"a":5,"b":6}}' \
     http://localhost:4321/calc