Seperate Varnish caching for HTTP and HTTPS

A high traffic site I host for a client needed to be available on both HTTP and HTTPS. This particular site, though, needed different caches depending on what scheme was used.

Note: Since Varnish doesn’t support HTTPS, it is in this case placed behind Nginx. Nginx then indicates any HTTPS requests passed onto by setting the X-Forwarded-Proto header.

With Varnish handling caching, this is what needed to be added to the configuration:

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