502 error after some time

[alexandre_corda]

Hi.

I'm currently facing an issue with SAP CAP.

The server application works fine, but after some time it begins responding to every request with a 502 status.

Do you guys know why this happens?

PS: This may be related to the number of users accessing the application, because it only happens in work hours.

[martinstenzig]

I have not seen that before. Did you make sure your Database is up? (Especially if you are running it in Trial?)

[alexandre_corda]

The database is running and the app starts working again after restarting it.

[Andrew_Mai]

Yep. Having this same error. No error log, I have one random request will return a 502 error code. During a high time usage. Still have no idea where this come from.

[Andrew_Mai]

Maybe you can try to increase the keepAliveTimeout value:

https://cap.cloud.sap/docs/advanced/troubleshooting#why-are-requests-rejected-with-status-502-and-do...

[alexandre_corda]

You also have to set a higher headersTimeout, as explained in this article :

https://adamcrowder.net/posts/node-express-api-and-aws-alb-502/#the-502-problem

I'm currently trying this approach.

I also started using the CF health-check, so the app can restart once the application stops working;

https://docs.cloudfoundry.org/devguide/deploy-apps/healthchecks.html

I'm going to update if it works.