On Tue, May 24, 2016 at 11:38 AM Glenn Morris <rgm@gnu.org> wrote:

Please try to use standard ctrl-f5 or equivalent rather than unnecessary
unblock commands.

https://en.wikipedia.org/wiki/Wikipedia:Bypass_your_cache

There won't be any changes to debbugs.gnu.org.

I agree, Ctrl-F5 has been my natural reflex when the browsers fetch stale stuff from their cache. I've been using that on Chrome/Firefox for ever. As you said, this has nothing to do with debbugs but with browser technologies. 
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Kaushal Modi