Some Squid problems at Aftonbladet?

I followed a link in the RSS feed from Aftonbladet, and got the error message below. Of course hard to say where the problem is, but it is the first time I see an error message from the Squid at Aftonbladet, and one of the very few times I see an error at all from them.

When I now try 5 minutes later, of course the link works…