Post data on Kinvey DataStore with Business Logic - google-app-engine

Question

I just started to work with Kinvey and I'm having some issues to POST data via REST api.
If I go in the datastore I'm able to save it, but it doesn't work when sending via POST.
To post data, I'm using the URL "/appdata/APP_KEY/DATASTORE/" and sending Authorization, X-Kinvey-API-Version and Content-Typein the Headers.
And I get back "An unknown internal error occured in the processing of the Business Logic code."
When I add my business logic with App Engine (for a while, it just returns status=200 to Kinvey), I have the same error:
{
"error": "BLInternalError",
"description": "The Business Logic script did not complete. See debug message for details.",
"debug": "An unknown internal error occured in the processing of the Business Logic code."
}
Does anyone have any idea where am I doing wrong?
For the last, even when I call Kinvey via GET the method that Kinvey calls App Engine is POST, is there a way to change it?
Despite the errors, I always have the log of access in Google App Engine.
Thank you!

Answer 1

I sent an email to Kinvey support and they helped me a lot.
Some of my mistakes:
The JSON that I was returning back was wrong [*];
I didn't add in the header of my response the Content-Type and status.
Now it works perfectly!
[*] The JSON that I send back in the body of the response is:
{
"request": {
"method": "<redacted>",
"username": "<redacted>",
"entityId": "<redacted>",
"collectionName": "<redacted>",
"headers": {
"connection": "<redacted>",
"host": "<redacted>",
"x-forwarded-for": "<redacted>",
"x-forwarded-port": "<redacted>",
"x-kinvey-api-version": "<redacted>",
"x-real-ip": "<redacted>",
"authorization": "<redacted>",
"x-forwarded-proto": "<redacted>"
},
"body": "<redacted>",
"params": "<redacted>"
},
"response": {
"complete": True,
"headers": {
"x-powered-by": "<redacted>",
"x-kinvey-api-version": "<redacted>",
"x-kinvey-request-id": "<redacted>"
},
"body": {},
"error": None,
"statusCode": 200
}
}
Thanks again to Brian in the Kinvey support!
[]'s