Ethereum JSON RPC API samples with HttpClient
Ethereum client installation instruction
geth --dev --rpc --rpcapi="db,eth,net,web3,personal" --rpcport "8545" --rpcaddr "127.0.0.1" --ipcpath \\.\pipe\geth-dev.ipc --solc "C:\Program Files\cpp-ethereum\solc.exe" --datadir "D:\Ethereum\ethereum-dev" console 2>> D:\Ethereum\ethereum-dev.log
--dev: Developer mode: pre-configured private network with several debugging flags
--rpc: Enable the HTTP-RPC server
--rpcaddr: HTTP-RPC server listening interface
--rpcport: HTTP-RPC server listening port
--rpcapi: API's offered over the HTTP-RPC interface
--solc: Solidity compiler command to be used
console: Geth Console: interactive JavaScript environment
Accessing Contracts and Transactions (with curl through JSON RPC)