As of a few weeks ago, Bnet has been failing to load well.
It often loads incompletely (icons fail to load), and very frequently gives a "304 error not modified", which just posts a string of code to the screen. This is an error I've never seen on the internet before.
Sometimes pages don't load at all.
I've put up with it, I just wondered if there was actually any sort of reason this was.
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I had the same error message about a month ago, not sure why it popped up, but it hasn't done it since then.