request validation utils

lib/utils/validation_utils.dart

@@ -0,0 +1,18 @@
+import 'package:apidash_core/apidash_core.dart';
+
+String? getValidationResult(HttpRequestModel requestModel) {
+  if (requestModel.url.trim().isEmpty) {
+    return 'Request URL is empty. Please provide a valid URL.';
+  }
+  if (requestModel.method == HTTPVerb.get && requestModel.hasAnyBody) {
+    return 'GET request contains a body. This is not supported.';
+  }
+  if (requestModel.hasJsonData) {
+    try {
+      kJsonDecoder.convert(requestModel.body!);
+    } catch (e) {
+      return 'Invalid JSON in request body: ${e.toString()}';
+    }
+  }
+  return null;
+}