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$ mg_jsonrpc ws://localhost:8000

$ websocat --text jsonrpc:- ws://localhost:8000/ws/jsonrpc

use websocat to debug, use input method and param, websocat is not converient to edit, improve it

mjsonrpc didn't include jsonrpc 2.0 version member, maybe use mjson_merge to fixup

1. https://www.jsonrpc.org/specification
2. https://github.com/cesanta/mjson
3. https://github.com/cesanta/mongoose
4. https://github.com/vi/websocat
5. http://catb.org/~esr/microjson/microjson.html