Send json correctly over HTTP request

Hello,

I somehow do not manage to send json data to an API. The curl request is like the following

curl --request POST --url 'https://example.com/exemplary_suburl/' -d 'data={json_data:values}' --header 'appkey: abcdef'

My corresponding Matlab code, which currently does not work is the following:

import matlab.net.http.*
import matlab.net.http.field.*
header = [ContentTypeField( 'application/json' ), ...
    HeaderField('appkey','exampleone')];
request = RequestMessage('POST', ...
    header, jsonencode(structSample));
options = matlab.net.http.HTTPOptions();
response = request.send('https://example.com/exemplary_suburl/', options);

There is always an error as the data parameter is not in a correct format. What parameters may I change to get it working?

Thank you!

[Mario Malic]

You call a function with no input arguments and that is probably the cause of an error.

request = RequestMessage('POST', header, jsonencode(struct));
%                                                   ^^ it's a function

[Alina D]

Do you refer to "struct" inside jsonencode? I am sorry, this was just a sample to hide the actual variable name.

[Mario Malic]

Oh, I see. Well, unfortunatelly I can help with this, maybe someone else can. Meanwhile, here's a partial example example of HTTP request message.