Retrieving webpage in Action Custom Code results in 'XMLHttpRequest error."

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/backend/schema/structs/index.dart';
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/actions/index.dart'; // Imports other custom actions
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom action code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

import 'package:http/http.dart' as http;

Future<String> fetchbusinessinfo(String businessNumber) async {

// This function takes a business registration number as input and returns
// the webpage of the corresponding business in Flutter

  // Construct the URL for the business' webpage
  String url =
      'https://www.governmentOrganization.org/' +
          businessNumber;

  // Use the http package to make a GET request to the URL

  var response;
  try {
    response = await http.get(Uri.parse(url));
      } catch (err) {
    print('Caught error = $err');
  }

  // Check if the response was successful
  if (response.statusCode == 200) {
    // If successful, return the HTML content of the webpage
    return response.body;
  } else {
    // If unsuccessful, throw an error
    throw Exception('Failed to load business webpage');
  }
}