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var xhr = new XMLHttpRequest();
xhr.open('GET', 'https://dotjs.local/' + window.location.host.replace(/^www\./, '') + '.js');
xhr.onreadystatechange = function() {
if(xhr.readyState == 4) {
if(xhr.status == 200) {
var script = document.createElement('script');
script.textContent = xhr.responseText;
document.head.appendChild(script);
return;
} else if(xhr.status == 404) {
var defaultXHR = new XMLHttpRequest();
defaultXHR.open('GET', 'https://dotjs.local/default.js');
defaultXHR.onreadystatechange = function() {
if (defaultXHR.readyState == 4 && defaultXHR.status == 200){
var script = document.createElement('script');
script.textContent = defaultXHR.responseText;
document.head.appendChild(script);
return;
}
}
defaultXHR.send();
}
}
};
xhr.send();