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Indeed 500 HTTP errors normally indicate a internal server issue. However, after cleaning up the stacktrace you have provided, I noticed that there was a error code of *404* being returned by the IBM SDK that you are using. Specifically, the following error message can be observed: * ibm_cloud_sdk_core.api_exception.ApiException: Error: NotFound:* session id 2900da9f-dd77-480a-a939-1a5b060b3f82 for agent instance 6656a86c-ad0e- 4463-8344-5f7fdcb4a6fe,* Code: 404* , *X**-global-transaction-id: *62a3d6c769187f0c2bfb3cabe994ed32 You may feel free to investigate the source of this 404 not found error within your code. Additionally, let me know if the 500 issue persists after resolving the 404 one. Look forward to hearing from you. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/18e40466-993f-499e-a02c-7bc47b2ff411%40googlegroups.com.