Just noticed this article is 3 yrs old which is probably why some of the advice seems out of date. Needs a section on http2/spdy

As they point out: Don't use SSL.

Also it's slower (despite marketing) and takes up more resources.

Http2 fixes the speed issue and generally requires HTTPS, Eventually all http will be encrypted.

Unfortunately some big names are dragging their feet implelenting http2 in servers, even though most clients already support it.

Suggestion: change title to HTTP (or Web) Caching Tutorial.

Eh, too late, maybe admins can help?