Empty response from server about eth-netstats HOT 2 CLOSED

{
  "name"        : "mynode-0",
  "cwd"         : ".",
  "script"      : "app.js",
  "log_date_format"   : "YYYY-MM-DD HH:mm Z",
  "merge_logs"    : false,
  "watch"       : false,
  "exec_interpreter"  : "node",
  "exec_mode"     : "fork_mode",
  "env":
  {
    "NODE_ENV"    : "production",
    "RPC_HOST"    : "1.2.3.4",   // my parity ip address
    "RPC_PORT"    : "8545",     // http rpc_api port for my parity node
    "INSTANCE_NAME"   : "mynode-0",
    "WS_SERVER"     : "http://localhost:3000",
    "WS_SECRET"     : "pswd",
  }
}