Question 230068 in Flutter Question posted in
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Flutter – Express web server deployed to prod but GET returns a timeout error

I have a server that is running Windows 10. I created an Express project using this repo. I ran in development mode just fine and I now want to deploy to production. I followed the instructions to do so:

  • Check for linting errors: npm run lint
  • Build the project for production: npm run build
  • Run the production build: npm start

However, when I try to send a GET request to the IP address of the server, I get a connection timed out error. Was I supposed to do other things to prepare for deploying to production? Do I need to specify a port number? I’m relatively new to web server development, so I apologize if this is a dumb question. I am sending the request through a Flutter app:

  void test() async {    
    var url = Uri.http('ServerIPAddress');

    try {
      var response = await http.get(url);
      if (kDebugMode) {
        print('Response status: ${response.statusCode}');
      }
    } catch (e) {
      if (kDebugMode) {
        print('ERROR: $e');
      }
    }
  }

Note: this is all on an internal network. It is not exposed to the public internet.

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2

Answers


  1. 0

    in order to create simple http server with nodejs + Express:

    
const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  res.send('Hello World!')
})

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})

    Then you can run in your browser like: http://localhost:3000/

    For running in a server, please search how to allow port in firewall. For CentOS:

    firewall-cmd --zone=public --add-port=3000/tcp --permanent
firewall-cmd --reload
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  2. 0

    The express-generator-typescript generates three different environment files by default which each defines some options for running in the different modes. You can find the different default profiles here:
    https://github.com/seanpmaxwell/express-generator-typescript/tree/master/lib/project-files/env

    For port number, these are the ones it will use by default:

    • 3000 (development)
    • 8081 (production)
    • 4000 (test)

    For connecting in Dart, I would recommend making use of Uri.parse instead of Uri.http because it does make it a lot easier since the latter is a bit more complicated to use.

    So something like the following for connecting to a production running server if using the default profiles:

    var url = Uri.parse('http://<IP_OR_DOMAIN_TO_SERVER>:8081/');

    Should be noted that in "real" production, you would not have this instance public but might instead have it forwarded though a proxy which can have HTTPS and run on port 443. E.g using nginx.

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