// Resize function resizeIframe(obj) {

obj.style.height = obj.contentWindow.document.body.scrollHeight + 'px';

}

// Fetch API helpers function checkStatus(response) {

if (response.status >= 200 && response.status < 300) {
    return response
} else {
    var error = new Error(response.statusText)
    error.response = response
    throw error
}

}

function parseText(response) {

return response.text()

}

function parseJSON(response) {

return response.json()

}