<!DOCTYPE html>
<html lang="ru-RU">

<head>
<meta charset="UTF-8">

<meta name="Access-Control-Allow-Origin" content="*">
<meta name="Access-Control-Allow-Headers" content="*">
</head>

<body>
<script type="text/javascript">

function transferComplete(evt) {
console.log(this.responseText);
}

function transferFailed(evt) {
console.log("An error occurred while transferring the file.");
console.log(this.responseText);
console.log(evt);
}

var oReq = new XMLHttpRequest();

oReq.addEventListener("load", transferComplete);
oReq.addEventListener("error", transferFailed);

oReq.open("POST", "https://api.owencloud.ru/v1/auth/open", true);

oReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

oReq.send('{"login":"demo@owen.ru","password":"dem o123"}');
</script>
</body>

</html>