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<!DOCTYPE html> <meta charset="utf-8"> <title>ok</title> <script> function try_fetch(url) { return fetch(url).then( response => { return "ok"; }, err => { return err.name; } ); } function try_fetch_status(url) { return fetch(url).then( response => { return response.status; }, err => { return err.name; } ); } </script>