use json mode & internal error

Author: swapydapy

src/a2a/server/request_handlers/default_request_handler.py

@@ -289,7 +289,7 @@ async def on_get_task_push_notification_config(
 
         push_notification_config = await self._push_notifier.get_info(params.id)
         if not push_notification_config:
-            raise ServerError(error=TaskNotFoundError())
+            raise ServerError(error=InternalError())
 
         return TaskPushNotificationConfig(
             taskId=params.id, pushNotificationConfig=push_notification_config

src/a2a/server/tasks/inmemory_push_notifier.py

@@ -41,7 +41,7 @@ async def send_notification(self, task: Task):
 
         try:
             response = await self._client.post(
-                url, json=task.model_dump(exclude_none=True)
+                url, json=task.model_dump(mode='json', exclude_none=True)
             )
             response.raise_for_status()
             logger.info(f'Push-notification sent for URL: {url}')

tests/server/request_handlers/test_jsonrpc_handler.py

@@ -527,7 +527,7 @@ async def streaming_coro():
                     json={
                         'contextId': 'session-xyz',
                         'id': 'task_123',
-                        'status': {'state': TaskState.submitted},
+                        'status': {'state': 'submitted'},
                         'type': 'task',
                     },
                 ),
@@ -542,7 +542,7 @@ async def streaming_coro():
                         ],
                         'contextId': 'session-xyz',
                         'id': 'task_123',
-                        'status': {'state': TaskState.submitted},
+                        'status': {'state': 'submitted'},
                         'type': 'task',
                     },
                 ),
@@ -557,7 +557,7 @@ async def streaming_coro():
                         ],
                         'contextId': 'session-xyz',
                         'id': 'task_123',
-                        'status': {'state': TaskState.completed},
+                        'status': {'state': 'completed'},
                         'type': 'task',
                     },
                 ),