This is my JavaScript function that does the POST
function loging() {
    $.ajax({
        url: "https://192.168.207.203:8443/e_ec_check",  
        type: "POST",  
        dataType: "json",  
        cache: false,   
        headers: {ContentType: "application/x-www-form-urlencoded"},
        body: {username: "admin", password: "admin"},
        success: function(response) {
            console.log(response);  
            if (response.auth === 1) {
                window.location.href = "https://192.168.207.203:8443/#/app/dashboard";  
            } else {
                $("#invalid").show();   
                centered($("#invalid"));
                $(window).resize(function() {
                    centered($("#invalid"));
                });
                setTimeout(function() {
                    $("#invalid").hide();
                }, 3000);
            }
        }
    });
}
<input type="button" value="submit" onclick="loging()" />
