File: xhr-iframe.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>iframe for xhr tests</title>
<script>
async function xhr(url, options) {
  return new Promise((resolve, reject) => {
    const xhr = new XMLHttpRequest();
    const opts = options ? options : {};
    xhr.onload = () => {
      resolve(xhr);
    };
    xhr.onerror = () => {
      reject('xhr failed');
    };

    xhr.open('GET', url);
    if (opts.responseType) {
      xhr.responseType = opts.responseType;
    }
    xhr.send();
  });
}
</script>