blocking requests doesn't seem to work

[nilskuhn]

I have to contradict myself:

I can't reproduce status-code of -2 locally in firebug or chrome dev-tools. The ottorum.gif-requests have times of 20-70 ms, but not 0-3 ms like in wpt-waterfalls.

I can reproduce status-code of -2 with a wpt-test without block-command.

So it seems, some mechanism in wpt leeds to status -2 and the short times (and it has nothing to do with the blocking)...