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<!DOCTYPE html>
<script>
function fetch_url(url) {
return new Promise(function(resolve, reject) {
var request = new XMLHttpRequest();
request.addEventListener('load', function(event) {
if (request.status == 200)
resolve(request.response);
else
reject(new Error('fetch_url: ' + request.statusText + " : " + url));
});
request.addEventListener('error', function(event) {
reject(new Error('fetch_url encountered an error: ' + url));
});
request.addEventListener('abort', function(event) {
reject(new Error('fetch_url was aborted: ' + url));
});
request.open('GET', url);
request.send();
});
}
</script>
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