Hi Tony
I have the same issue, did you find a way to solve it?

On Wednesday, February 1, 2017 at 4:16:00 PM UTC+2, Tony Stark wrote:
>
> Since yesterday does not work datastore through the flex evironment. 
> Application just not receives the response from the datastore. If I run the 
> application locally, everything works. If I try to do those operations in 
> app engine - it does not work. The answer does not come from the server. If 
> wait a long time, the message from the nginx is  "502 Bad Gateway".
>
> There are no errors in the app; it works locally. And even before 
> yesterday everything worked perfectly in the app engine.
>
> https://lynkus-api-test.appspot.com/test - here is no request to the 
> datastore, the answer comes from the application.
> https://lynkus-api-test.appspot.com - here is a request, but there is no 
> answer :(
>
> if you go in the app engine instance, in /var/log/nginx/error.log there 
> are reports like this:
>
> 2017/02/01 09:15:59 [error] 32#32: *736 upstream prematurely closed 
> connection while reading response header from upstream, client: 
> 130.211.3.225, server: , request: "GET / HTTP/1.1", upstream: "
> http://172.18.0.2:80/";, host: "lynkus-api-test.appspot.com"
>

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