Beware: When using xhr.responseType = "json", if the response is not valid JSON you will just silently get xhr.response = null and NO error!
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Replying to @LeaVerou
@LeaVerou The authors of the Gecko code didn't seem so happy about it either: hg.mozilla.org/mozilla-centr…

May 1, 2016 · 4:12 AM UTC
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