Return 404 for unknown tasks

api/resources/root.py

@@ -15,7 +15,7 @@ class RootResource:
         self.max_tasks = 5
 
     def on_get(self, request, response):
-        response.text = 'HES Server v1.2410.0'
+        response.text = 'Human Eval for Solidity Server v1.2410.0'
 
     def on_post(self, request, response):
         payload = request.media
@@ -44,6 +44,10 @@ class RootResource:
                 passed = evaluate_solution(task_id, solution)
 
             response.media = {'passed': passed}
+        except FileNotFoundError as e:
+            logging.error('Task not found: {}'.format(str(e)))
+            response.status = falcon.HTTP_404
+            response.media = {'error': 'Task not found'}
         except Exception as e:
             logging.error('Error processing request: {}'.format(str(e)))
             response.status = falcon.HTTP_500