Shows how socket acts like a more standard REST api, with request / response

getRealtimeDataInstantaneous.js

// Allows the client to get the data without having to wait for a new REQUEST_INTERVAL.
socket.on('getRealtimeDataForStations', (stations) => {
  if (datastore.realtime && Array.isArray(stations)) {
    stations.forEach((locationCode) => {
      socket.emit(`realtime/${locationCode}`, datastore.realtime[locationCode]);
    });
  }
});