varnish

Caching both HTTPS and HTTP Drupal sites behind HAproxy and Varnish

Scenario: you have a Drupal site behind a proxy such as HAproxy, sending traffic to a Varnish backend (which in turn sends to the Nginx or Apache backend).

You want to serve cached pages from Varnish for both HTTP and HTTPS. Perhaps you've tried this and you found that behind HTTPS, your site had no CSS or JS. This is because it's serving a page object that was cached as HTTP, or it's not caching at all, but Drupal is serving the markup with http:// links and your browser won't allow that to be displayed under https:// .

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Excluding IPs from HTTP auth when Apache is behind Varnish

I had a situation whereby I had to protect a site with HTTP auth, but exclude a certain IP address or two from having to use HTTP auth (e.g loadtesting).

The problem was, the site was also behind a Varnish proxy. So I couldn't do 'Allow from (ip)' in the Apache settings, because the IP would always be the IP address of the Varnish server at this point.

And obviously, I couldn't 'Allow from (varnish ip)' because that's the same as not having any HTTP auth at all :)

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