http://localhost:20000/cli

{
  qid: "XXX",      // Request ID. The response will echo back the same qid
  method: "XXX",   // Requested method name
  account: "XXX",  // Account for sign
  pwd: "XXX",      // Account password
  params: {}       // Input parameters for the requested method
}

{
  qid: "XXX",         // Request ID
  method: "XXX",      // Requested method name
  result: {           // Response result
    signed_tx: "XXX"  // Signed transaction
  },
  error_code: 0,      // Error code，zero represents success, non-zero represents failure
  error_info: ""      // Error description
}