Why does POST request have status code 204?

Question

JavaScript

You need to send data from the body object as a post request.
Why is the request displayed twice in Network and the first one with status 204?


Tell me what I'm doing wrong.

let body = {
        user: {
            phone: `${ phone }`,
            firstName: `${ name }`,
            email: `${ email }`,
        }
    };

let url = `https://....`;

postData(url, body)
.then(data => {console.log(JSON.stringify(data))})
.catch(error => console.error(error));
function postData(url, data) {
    return fetch(url, {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json; charset=utf-8',
            'Accept': 'application/json'
        },
        body: JSON.stringify(data),
    })
    .then(response => response.json());
}

Answer 1

Everything is good.
For cross-domain requests, the browser does preflight , and for it 204 is the norm.