request-body-blob-crash-iframe.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>request-body-blob-iframe</title>
<body></body>
<script>
// Make a big blob to force async construction.
var blob = new Blob(['it\'s me the blob',
                     new Float64Array(2*1024*1024),
                     'and more blob!']);
fetch('simple.html?post-with-blob-body',
      { method: 'POST', body: blob })
  .then(resp => {
      if (!resp.ok)
        return Promise.reject('bad response: ' + resp.status);
      return resp.text()
    })
  .then(text => parent.done(text))
  .catch(error => {
      var reason = error.message || error.name || error;
      parent.done('error: ' + reason);
    });
</script>

chromium/third_party/blink/web_tests/http/tests/serviceworker/resources/request-body-blob-crash-iframe.html