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<?php
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header('Cache-Control: max-age=20, stale-while-revalidate=80');
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sleep(10);
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print('This is a slow test. ' . date('Y-m-d H:i:s'));
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?>
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<p id="js-date"></p>
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<script type="text/javascript">
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document.getElementById('js-date').innerText = new Date().toISOString();
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</script>
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