Katalon - Upload a file using POST API

I’ve searched for this issue and seems to be discussed a couple of times but with no real resolution.

I’m trying to upload an XML file using a POST request and form-data, but I get the following error response:

{
  "error":"The results file is required."
}

The error shows using ObjectRepository and also by code using with withMultipartFormDataBodyContent()

If I use curl it works fine. Also works fine with Postman.

Can someone please help me with this?

Thanks.

After a looooooooooooong time of searching and trying different things I already found the solution (that works for me). It uses Okhttp library so you will need to import it. If anyone else need it, there it is:

public void importJUnitTestExecRequest() {
    
    OkHttpClient client = new OkHttpClient();
    String reportFile = GlobalVariable.reportFolder + "\\JUnit_Report.xml";
    File file = new File(reportFile);

    String url = GlobalVariable.importTestExecJUnitEndpoint+"?testExecKey="+GlobalVariable.testExecKey;

    //Form request body that will be a multipart
    RequestBody requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM)
            .addFormDataPart("file", file.getName(), RequestBody.create(MediaType.parse("text/xml"), file))
            .build();

    //Form the actual request adding necessary headers
    Request request = new Request.Builder()
            .url(url)
            .post(requestBody)
            .addHeader("Content-Type", GlobalVariable.contentTypeMultipart)
            .build();

    Response response = null;

    try {
        response = client.newCall(request).execute();
        println("************ IMPORT TEST EXECUTION RESULTS RAW RESPONSE ************");
        println("Response status: " + response);
        println("********************************************************************");
        if (response.isSuccessful()){
            String responseBody = response.body().string();
            println("************ IMPORT TEST EXECUTION RESULTS RESPONSE BODY ************");
            println(responseBody);
            println("*********************************************************************");
        } else {
            throw new IOException("Unexpected HTTP code " + response);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

}

I've opened a ticket to support because with the built in functionality in Katalon, it is currently (or I don't know how to do it) not possible.