Search in local api, react-native

I have a local api in eclipse and I'm using tomcat I'm trying to use it with XMLHttpRequest in react-native and I'm not always getting error request.

onPressButtonAtualizarBanco=() => {

    var request = new XMLHttpRequest();
    request.onreadystatechange = (e) => {
        if (request.readyState !== 4) {
            return;
        }
        if (request.status === 200) {
            console.log('success', request.responseText);
        } else {
            console.warn('error');
        }
    };

    request.open('GET', 'http://localhost:8080/Restful/cliente/brinddata');
    request.send();
}

The api data is returning in xml so I am using the XMLHttpRequest