I'm posting a data with XHR in the project I'm coding. A JSON reaches the Controller but if I use [FromBody] I get error code 415. If I don't use it, the incoming JSON looks empty.

Controller

[HttpPost]
[IgnoreAntiforgeryToken]
[Route("revizedCategoryzfc")]
public void revizedCategoryzfc([FromBody] Category model) 
{
    if (model.fileCode != null)
    {
        System.Console.WriteLine(model.fileCode);
    }
    System.Console.WriteLine("Girdi");
}

Post XHR Code

async function makeRequest(method, url, model) {
    return new Promise(function(resolve, reject) {
        let xhr = new XMLHttpRequest();
        xhr.open(method, url);

        xhr.onload = function() {
            if (this.status >= 200 && this.status < 300) {
                resolve(xhr.response);
            }else {
                reject({
                    status: this.status,
                    statusText: xhr.statusText
                });
            }
        };

        xhr.onerror = function() {
            reject({
                status: this.status,
                statusText: xhr.statusText
            });
        };

        xhr.send(model);
    });
}

document.querySelector('.save-service').addEventListener('click', async () => {
    for (var es of document.querySelectorAll('.category-item'))
    {
        await makeRequest('POST', '/zfc/revizedCategoryzfc', JSON.stringify({
            "Name": es.querySelector('.service-name').value,
            "fileCode": es.querySelector('.filecodas').value,
            "CategoryId": es.querySelector('.zfc-id').value
        }))
    }
})

Error