unhandled socket exception with no internet connection when i set timeout duration

If you want to implement a timeout with the http package, here is how it can be done:

import 'dart:io';import 'package:http/http.dart' as http;import 'package:http/io_client.dart' as http;Future<void> login(String email, String password) async {    final ioClient = HttpClient();    client.connectionTimeout = const Duration(seconds: 5);    final body = { 'email': email, 'password': password };    final client = http.IOClient(ioClient);    http.Response res;    try {      res = await client        .post(          '$url/login',          headers: {'Content-Type': 'application/json'},          body: jsonEncode(body));    } on SocketException catch (e) {      // Display an alert, no internet    } catch (err) {      print(err);      return null;    }    // Do something with the response...}

You should consider using the HTTP package https://pub.dev/packages/http as it helps cleanup your code an helps with error handling.

Here's an example of a GET request using the package :

await http.get(url).then((response) async { // DO SOMETHING HERE});

response.body is your data.response.statusCode is your http status code (200, 404, 500, etc.)

https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

and here's a post request with data :

var data = {      "dataset1": {        "key1": "value",        "key2": "value",      },    };await http.post(url,  body: jsonEncode(data),  headers: {'content-type': 'application/json'}).then((response) async {    // DO SOMETHING HERE});