diff --git a/bin/mess_api.dart b/bin/mess_api.dart
index 6115721..1ab3f7b 100644
--- a/bin/mess_api.dart
+++ b/bin/mess_api.dart
@@ -1,8 +1,9 @@
 import 'dart:io';
+import 'dart:convert';
 import 'package:mysql1/mysql1.dart';
 import 'package:mess_api/config.dart';
 
-Future<void> testDbConnection() async {
+Future<int> getTestNumber() async {
     final settings = ConnectionSettings(
         host: DBConfig.dbHost,
         port: DBConfig.dbPort,
@@ -12,29 +13,24 @@ Future<void> testDbConnection() async {
     );
 
     final conn = await MySqlConnection.connect(settings);
-
     final results = await conn.query(
         'SELECT test_number FROM test_table LIMIT 1',
     );
+    await conn.close();
 
     if (results.isEmpty) {
         throw Exception('DB CONNECT FAIL: no data');
     }
 
-    final value = results.first['test_number'];
-
+    final value = results.first['test_number'] as int;
     if (value != 777) {
         throw Exception('DB CONNECT FAIL: value=$value');
     }
 
-    print('DB CONNECT OK (777)');
-
-    await conn.close();
+    return value;
 }
 
 void main() async {
-    await testDbConnection();
-
     final server = await HttpServer.bind(
         InternetAddress.anyIPv4,
         AppConfig.port,
@@ -43,9 +39,39 @@ void main() async {
     print('API server running on http://localhost:${AppConfig.port}');
 
     await for (HttpRequest request in server) {
+        // CORS
+        request.response.headers
+            ..set('Access-Control-Allow-Origin', '*')
+            ..set('Access-Control-Allow-Methods', 'GET, POST, OPTIONS')
+            ..set('Access-Control-Allow-Headers', 'Content-Type');
+
+        if (request.method == 'OPTIONS') {
+            request.response
+                ..statusCode = HttpStatus.ok
+                ..close();
+            continue;
+        }
+
+        if (request.uri.path == '/db') {
+            try {
+                final value = await getTestNumber();
+                request.response
+                    ..statusCode = HttpStatus.ok
+                    ..headers.contentType = ContentType.json
+                    ..write(jsonEncode({'value': value}))
+                    ..close();
+            } catch (e) {
+                request.response
+                    ..statusCode = HttpStatus.internalServerError
+                    ..headers.contentType = ContentType.json
+                    ..write(jsonEncode({'error': e.toString()}))
+                    ..close();
+            }
+            continue;
+        }
+
         request.response
-            ..statusCode = HttpStatus.ok
-            ..write('ok')
+            ..statusCode = HttpStatus.notFound
             ..close();
     }
 }