Strange behaviour related to java Endpoints V2

[Þórir Gunnarsson]

Hi

Just wanted to check with the group if anyone is experiencing unusual behaviour related to endpoints v2 on AppEngine. We are using the AppEngine standard environment.

This morning we start getting reports from users where our Android client is crashing a lot. Upon investigation we discover that yesterday (30.03.2017) at 16:36 UTC we start getting unusual entries in the log that look like this:

/_ah/api/appendpoint/v8/users/<user id omitted>/dashboarddata

and a HTTP 302 response according to the logs (this then results in a crash in the Android client, which is a different story)

On a regular day and most of the time this call from the client looks like this.

/_ah/spi/is.app.services.dashboard.DashboardEndpointV9.getDashboardData

The strange thing here is the format of the log entry which is consistent with the format of log entries after upgrading to endpoints v2. 

We see the same exact Android client making this call and once in a while it seems to get the new type of response (the endpoints v2 type log entry and a 302).

We did not deploy anything at this time yesterday and we were certainly not using endpoints v2 at that time.

After some testing we have now improved the situation by upgrading our backend to using endpoints v2 (version 2.0.5). 

I say improved because now most log entries look like they are coming from endpoints v2 but once in a while we get the old style log entries and now the old style log entries return 302 (according to server logs)

The Android client no longer crashes but doesn't receive a response when this happens.

To further investigate what was happening we plugged in a http proxy to see exactly what was going on.

On a successful call there is a GET call to the server with a proper HTTP 200 OK response

On a failure there is a GET call to the server with a HTTP 404 NOT FOUND response and an "unsupportedProtocol" error.

We don't see any difference between the two calls. The server logs tell us that both are served by the same instance on the backend.

 

So is anyone experiencing something similar?

Should we pin this on some Google update or possibly some misconfiguration on our end?

[Nick (Cloud Platform Support)]

Hey Þórir,

This is perfect as an issue report for the Public Issue Tracker, where we work with users to notify product teams and engineering of issues on the platform. Feel free to post this there and we'll be able to take a look. I can't say I've seen anything like this before. Be sure to include all the details given in this report. We may ask for you to reply to a private email we'll send if we require copies of the logs or your code.

Cheers,

Nick
Cloud Platform Community Support

[Þórir Gunnarsson]

I have created a public issue https://issuetracker.google.com/u/1/issues/36825521 but as the issue is now resolved after updating our SDK version and build tools to the latest versions the issue is more for informational purposes than something needing immediate attention.

[Teke Sawo]

I am experiencing the same issue.

Do we find any solution?

[Þórir Gunnarsson]

Hi

This stopped being an issue for us after updating the backend to use Endpoints V2. We never really figured out exactly what caused the issue in the first place.

ÞG

[Dan Ciruli]

We are investigating and will report back findings here. 

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[Teke Sawo]

Hi

I have been developing with python. I updated to Endpoint version 2.0.6 following guide from here. 

But the issue is not fixed.

[Teke Sawo]

Any updates?

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