Getting inconsistent 500 error - inconsistent Error code 204 on Google App Engine PHP Standard

[Shaharia Azam]

Hello,

Recently one of our sites got suspended by Google Ads due to "Destination Not Working". When I talked with Google Support they told me that my site is not accessible from all location globally. Then I tried to investigate, the site is hosted on Google App Engine. And I didn't find any 500 errors. But sometimes some website checking tools like "Uptrends" showed me inconsistent error "Http Protocol Error"/500 error. Then I tried to see closely on Google stackdriver logging and ran several tests on Uptrends and on other tools. But I saw something like this.

And on App Engine logging, I saw something like -

And also sometimes some HTTP request is not hitting my app so my app logging is not working and it's bothering us so much. We are losing tons of our marketing budget due to this facts. So it would be great if anybody come forward and tell me any clue to test and help me to investigate.

- Shaharia

[Kaan Soral]

I investigated issues like this one a lot, tried to get them fixed: https://groups.google.com/forum/#!topic/google-appengine/mkDuThzy-3g

But no luck, they just get ignored, solution: use another product

Like you mentioned, most of these issues don't even hit the logs, they are hidden from you, and that's the biggest issue

[Olivier Yiptong]

Hi Shaharia,

Please file a bug so we can investigate.

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[Olivier Yiptong]

The issue tracker can be found at https://issuetracker.google.com

[George (Cloud Platform Support)]

Hello Shaharia, 

You can now follow progress in your identical Public Issue Tracker issue 123731553. 

Advertising Policies indicate that destination are suspended if such destinations don't function properly or have been incorrectly set up. You should ensure your site is working properly and in compliance to such requirements, in other works, destination working.  

500 errors are described as "Internal Server Error" on the "HTTP Status and Error Codes for JSON" documentation page. To avoid such errors, your app should implement a strategy of Truncated Exponential Backoff. You should click on the "expand all" link in logs, to see the entire error message, and use the information thus gathered to debug your app and avoid errors in future.