请求自己部署在Heroku上的Node.js

Question

I have a Node Express App deployed on Heroku. The main page needs around 50 HTTP Requests to external services to display the data. The requests take so long, so Im using cache.

Now Im tring to request the webpage periodically to myself in order to force Node to continue refreshing and caching the data. This way the user wont have to wait 1 minutes to see the page.

Following code works perfectly on local. But at production enviroment (Heroku) I get Error: connect ECONNREFUSED

setInterval(function() {
  var url = "http://127.0.0.1:" + (process.env.PORT || 3000);
  try {
    http.get(url, {})
  } catch (err) {
    console.error('Error refreshing data')
    console.error(err)
  }
}, 1 * 60 * 1000)

I have tried:

• http://127.0.0.1:" + (process.env.PORT || 3000)
• https://127.0.0.1:" + (process.env.PORT || 3000)
• 0.0.0.0

Any way to find the correct ip/host and port?

UPDATE

Name of the host ( https://nameofapp.herokuapp.com/ ) actually works. But is there any way to call myself without knowing the host?

Answer 1

You can use request-myself

Try this code:

const requestMyself = require('request-myself');
const option = {
    hostname: process.env.BASE_URL,
    timeout: process.env.TIME_IDLING
};

app.use(requestMyself(option, (error, res) => {
    if (error) {
        console.error('RequestMyself error:', error);
    } else {
        console.info('RequestMyself statusCode:', res.statusCode);
    }
}));

set your environment variable BASE_URL is your app's url, TIME_IDLING is timeout to request (or you can change when define option )

If you has some problem, you feel free to create an issue

Check dyno-metadata , to auto generate HEROKU_APP_NAME and some env ( process.env.HEROKU_APP_NAME ), use it to get your host