json-rpc testing
json-rpc is stateless, light-weight remote procedure call (RPC) protocol.
- json-rpc over HTTP
### json-rpc over http
JSONRPC http://127.0.0.1:8080/add
Content-Type: application/json
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- json-rpc over TCP
### json-rpc over tcp
JSONRPC tcp://127.0.0.1:9080/add
Content-Type: application/json
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