Implement local HTTP Api usage

lib/api/apiRequest.dart

@@ -0,0 +1,39 @@
+import 'dart:developer';
+
+import 'package:http/http.dart' as http;
+import 'package:marianum_mobile/api/apiError.dart';
+
+class ApiRequest {
+  Uri endpoint;
+
+  ApiRequest(this.endpoint);
+
+  Future<http.Response> get(Map<String, String>? headers) async {
+    return await http.get(endpoint, headers: headers);
+  }
+
+  Future<http.Response> post(String data, Map<String, String>? headers) async {
+    log("Fetching: ${data}");
+    try {
+      http.Response response = await http
+          .post(endpoint, body: data, headers: headers)
+          .timeout(
+          const Duration(seconds: 10),
+          onTimeout: () {
+            log("timeout!");
+            throw ApiError("Network timeout");
+          }
+      );
+
+      if(response.statusCode != 200) {
+        log("Got ${response.statusCode}");
+        throw ApiError("Service response invalid, got status ${response.statusCode}");
+      }
+      return response;
+
+    } on Exception catch(e) {
+      throw ApiError("Http: ${e.toString()}");
+    }
+
+  }
+}