Hello. Thanks for posting to the community here.

In order to help here, I would need some more information, assuming you're 
still experiencing this issue:

   - The error mentioned may have a few different causes. Can you provide 
   the full stack trace?
   - Can you provide the request and response headers for both your C# 
   client test and Postman test?
   - Is your Python application serving response over HTTP/HTTPS? Are you 
   compressing the responses?
   - On what OS is your C# client being developed and run?
   
With the above information, I may be better equipped to help you find a 
solution.

On Friday, March 11, 2016 at 10:24:36 AM UTC-5, Леонтьев Пётр wrote:
>
> We have Python app engine backend. It was correctly responding except last 
> 3 hours. C# Client is getting error when trying to parse response callback 
> from POST request.
>
> C# code to end getting response:
> WebResponse wr = _webRequest.EndGetResponse(ar).
> Exception says "Message: System.Net.WebException: MonoPosixHelper ---> 
> System.DllNotFoundException: MonoPosixHelper".
>
> It is strange because only from google appengine we can't get response to 
> POST request in C# code. Response is ok when we're trying to use Chrome 
> Postman or even raw python requests.
>
> Please, ask for details.
>
> Best regards, 
> Peter
>
>

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