rog_app/lib/services/location_polygon_service.dart

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

class LocationPolygonervice{

   static Future<GeoJsonFeature?> loadLocationLines() async {
    final geo = GeoJson();
    GeoJsonFeature? fs;

    //String url = 'http://container.intranet.sumasen.net:8100/api/location_polygon/';
    String url = 'http://localhost:8100/api/location_polygon/';
    final response = await http.get(Uri.parse(url),
      headers: <String, String>{
        'Content-Type': 'application/json; charset=UTF-8',
      },
    );

    if (response.statusCode == 200) {

      geo.processedFeatures.listen((fst) {
        fs = fst;
      });

      await geo.parse(response.body, verbose:true);

      return fs;

    } else {
      throw Exception('Failed to create album.');
    }
  }

}