Internal Server Error after a few minutes of app running smoothly

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Jul 8, 2019, 9:34:38 AM7/8/19

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Hi there,

I'm running an sms chatbot using Python, Twilio and IBM Watson. After I launch it on GAE, it runs fine for a few minutes, then suddenly stops responding. When I visit the page, it throws an Internal Server Error. Any ideas why this is happening? My app.yaml file has a default_expiration of 1 day and 23 hours, so I don't think that's the issue. Here are the logs:

2019-07-06 08:34:55 default[20190706t180659] "GET /sms HTTP/1.1" 500

2019-07-06 08:34:55 default[20190706t180659] [2019-07-06 08:34:55,204] ERROR in app: Exception on /sms [GET]

2019-07-06 08:34:55 default[20190706t180659] Traceback (most recent call last): File "/env/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app response = self.full_dispatch_request() File "/env/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request rv = self.handle_user_exception(e) File "/env/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception reraise(exc_type, exc_value, tb) File "/env/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise raise value File "/env/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request rv = self.dispatch_request() File "/env/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args) File "/srv/main.py", line 81, in incoming_sms r = Watson(b) File "/srv/main.py", line 42, in Watson input = message_input File "/srv/ibm_watson/assistant_v2.py", line 244, in message accept_json=True) File "/srv/ibm_cloud_sdk_core/base_service.py", line 358, in request raise ApiException(response.status_code, error_message, http_response=response) 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

Harmit Rishi (Cloud Platform Support)

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Jul 9, 2019, 1:49:23 PM7/9/19

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Hello,

Thank you for using Google Groups!

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: ... for agent instance ....., Code: 404 , X-global-transaction-id: ....

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.