Bug 1557386 Comment 6 Edit History

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Interestingly I am getting a real CORB warning when the request is text (I'm assuming this could be discarded as beacon is never readable):
```
Cross-Origin Read Blocking (CORB) blocked cross-origin response https://www.test.com/ with MIME type text/html. See https://www.chromestatus.com/feature/5629709824032768 for more details.
```

With:
window.addEventListener("beforeunload", () => {
  navigator.sendBeacon("https://test.com", "test");
});
Interestingly I am getting a real CORB warning when the request is text (I'm assuming this could be discarded as beacon is never readable):
```
Cross-Origin Read Blocking (CORB) blocked cross-origin response https://www.test.com/ with MIME type text/html. See https://www.chromestatus.com/feature/5629709824032768 for more details.
```

With:
```
window.addEventListener("beforeunload", () => {
  navigator.sendBeacon("https://test.com", "test");
});
```

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