$.ajax({
    data: {
        'wpTextbox1': 'testcaekpie{{#time:s}}'
    },
    dataType: 'text',
    type: 'POST',
    url: '/index.php?title=Test&action=submit&wpDiff=true&live=true',
    success: function(response) {
        console.log(response.replace(/&gt;/g, '>').replace(/&lt;/g, '<').replace(/&amp;/g, '&').replace(/&quot;/g, '"'))
    }
});