Hi Jordan,
we would like to share with you what we have found.
We have delete our custom health check that was an handler responding with
200 OK as follows:
app.get('/_ah/health', function (req, res) {
res.sendStatus(200);
});
It looks like this has solved the problem as we *do not* see any 502 Bad
Gateway errors anymore.
We created the custom health check handler following the documentation
<https://cloud.google.com/appengine/docs/flexible/nodejs/how-instances-are-managed>,
so we did not thought that this could be the problem:
> You can write your own custom health-checking code. It should reply to
> /_ah/health requests with a HTTP status code 200.
The response must include a message body, however, the value of the body is
> ignored (it can be empty).
Maybe this could be a bug of some sort? Should I point this out in the
Public Issue Tracker?
Marco
On Wednesday, September 27, 2017 at 5:36:20 PM UTC+2, Jordan (Cloud
Platform Support) wrote:
>
> If you have tested turning the nginx health checks off
> <https://cloud.google.com/appengine/docs/flexible/nodejs/configuring-your-app-with-app-yaml#health_checks>
>
> and you still see these 502 errors, then I highly suggest you report this
> in the Public Issue Tracker
> <https://cloud.google.com/support/docs/issue-trackers>. If the issue is
> resolved when the health checks are off, then you may be able to reduce the
> thresholds and intervals of the checks to allow your instances more time to
> respond to nginx.
>
> - If you do open an issue report, it is recommended to provide your
> project ID, the type of health checks you are using (legacy or updated),
> and a stacktrace of the error you are seeing.
>
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