Drupal site with Varnish, returning page without style on CTRL+F5

I had serious problems with a Drupal website with many Varnish optimizations. It so occurs that one of them, a return(lookup) on images and css extensions, was really the one causing the problem: if (req.url ~ “.(png|jpg|jpeg|swf|css|ico)”) { return(lookup); }…

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What HTTP headers do browsers send on CTRL+F5?

If you’ve been into website development, and in particular website optimization, you probably have stumbled upon that question at least once: what HTTP headers do the different browsers send when the user presses F5 or (even better) CTRL+F5, to make…

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