webwrite sending POST JSON isn't working | MATLAB IoT Analytics | Forum

hi,

I'm trying to send some data to powerbi dataset via RESTful API. Server expects it in this format (JSON starts with square brackets)

[
{
"field1" :"AAAAA555555",
"field2" :"AAAAA555555",
"field3" :"AAAAA555555"
}
]

I've tested it with postman and it's working fine,

here is my code in MATLAB

options = weboptions('MediaType','application/json','RequestMethod','post');
data = '[{"field1":"AAAAA555555","field2":"AAAAA555555","field3":"AAAAA555555"}]';
powerbiURL = 'https://api.powerbi.com/beta/%%%/datasets/%%%/rows?key=%%%%';
response = webwrite(powerbiURL, data, options)

Here is the error:
Error using readContentFromWebService (line 46)
The error "Error copying data." occurred while communicating with URL
Error in webwrite (line 139)
[varargout{1:nargout}] = readContentFromWebService(connection, options);

if I use response = webwrite(powerbiURL, jsondecode(data), options), I get this error which means that it's missing wrapping [ ] brackets

Error using readContentFromWebService (line 46)
The server returned the status 400 with message "Bad Request" in response to the request to URL

What's the workaround? How can I debug it and see what's the request header that is being sent?

Thanks.