dify - 💡(How to fix) Fix Exceeded limit on max bytes to request body [2 comments, 3 participants]

2026-04-15 09:05:38.910 ERROR [GraphWorker-1] [base.py:271] - Error in stream response for plugin {'code': -500, 'message': '{"message":"{"args":{"description":"Failed to invoke model qwen-plus-latest, status code: 400, message: Exceeded limit on max bytes to request body : 6291456, request_id: 440410cb-4463-9631-a387-9c8b7f7c40b8"},"error_type":"InvokeBadRequestError","message":"Failed to invoke model qwen-plus-latest, status code: 400, message: Exceeded limit on max bytes to request body : 6291456, request_id: 440410cb-4463-9631-a387-9c8b7f7c40b8"}","error_type":"PluginInvokeError","args":null}', 'data': None} 2026-04-15 09:05:38.911 ERROR [GraphDispatcher] [error_handler.py:101] - Node 1774408935505 failed with ABORT strategy: Failed to invoke model qwen-plus-latest, status code: 400, message: Exceeded limit on max bytes to request body : 6291456, request_id: 440410cb-4463-9631-a387-9c8b7f7c40b8 2026-04-15 09:05:39.017 ERROR [Thread-92439 (_generate_worker)] [workflow_entry.py:111] - Unknown Error when workflow entry running Traceback (most recent call last):

TL;DR

The issue is likely caused by exceeding the maximum allowed bytes in the request body when invoking the AI model, and increasing the limit or optimizing the request payload may resolve the issue.

Guidance

• Check the Dify configuration parameters to see if there is a setting to increase the maximum allowed bytes in the request body.
• Verify if the AI model itself has a limit on the maximum request body size and if it can be adjusted.
• Consider optimizing the request payload to reduce its size and stay within the allowed limit.
• Review the error message and request ID to see if there are any additional details or clues about the cause of the issue.

Example

No code snippet is provided as the issue seems to be related to configuration or model limitations rather than code.

Notes

The issue may be specific to the self-hosted Dify setup using Docker, and the solution may vary depending on the specific configuration and model being used.

Recommendation

Apply workaround: Increase the maximum allowed bytes in the request body or optimize the request payload to resolve the issue, as it is likely caused by a limitation in the Dify configuration or the AI model itself.