dify 有时候返回信息时报 400 #32
Description
请教一下，如下日志，在收到一堆重复的 agent_message 后，会来一个 'event': 'error'，内容是 'status': 400, 'message': "Expecting ',' delimiter: line 1 column 300 (char 299)"。不是必现的，请问可能的异常原因是什么？
2025-12-22 23:51:37.356 | DEBUG | core.handlers:_call_dify_with_stream:267 - 接收到模型服务返回：{'event': 'agent_message', 'conversation_id': '03f071c1-305c-41b7-9853-318e565a09aa', 'message_id': '8d9003d5-27c8-4c08-bd06-e251374e90f7', 'created_at': 1766418672, 'task_id': 'd81ea1d8-4a08-4fa7-8051-39220d2c8779', 'id': '8d9003d5-27c8-4c08-bd06-e251374e90f7', 'answer': ''}
2025-12-22 23:51:37.356 | DEBUG | core.handlers:_call_dify_with_stream:267 - 接收到模型服务返回：{'event': 'agent_message', 'conversation_id': '03f071c1-305c-41b7-9853-318e565a09aa', 'message_id': '8d9003d5-27c8-4c08-bd06-e251374e90f7', 'created_at': 1766418672, 'task_id': 'd81ea1d8-4a08-4fa7-8051-39220d2c8779', 'id': '8d9003d5-27c8-4c08-bd06-e251374e90f7', 'answer': ''}
2025-12-22 23:51:37.356 | DEBUG | core.handlers:_call_dify_with_stream:267 - 接收到模型服务返回：{'event': 'agent_message', 'conversation_id': '03f071c1-305c-41b7-9853-318e565a09aa', 'message_id': '8d9003d5-27c8-4c08-bd06-e251374e90f7', 'created_at': 1766418672, 'task_id': 'd81ea1d8-4a08-4fa7-8051-39220d2c8779', 'id': '8d9003d5-27c8-4c08-bd06-e251374e90f7', 'answer': ''}
2025-12-22 23:51:37.357 | DEBUG | core.handlers:_call_dify_with_stream:267 - 接收到模型服务返回：{'event': 'agent_message', 'conversation_id': '03f071c1-305c-41b7-9853-318e565a09aa', 'message_id': '8d9003d5-27c8-4c08-bd06-e251374e90f7', 'created_at': 1766418672, 'task_id': 'd81ea1d8-4a08-4fa7-8051-39220d2c8779', 'id': '8d9003d5-27c8-4c08-bd06-e251374e90f7', 'answer': ''}
2025-12-22 23:51:37.457 | DEBUG | core.handlers:_call_dify_with_stream:267 - 接收到模型服务返回：{'event': 'error', 'conversation_id': '03f071c1-305c-41b7-9853-318e565a09aa', 'message_id': '8d9003d5-27c8-4c08-bd06-e251374e90f7', 'created_at': 1766418672, 'code': 'invalid_param', 'status': 400, 'message': "Expecting ',' delimiter: line 1 column 300 (char 299)"}