HTTP/2 and the HOL in the Waterfall

This year was HTTP/2’s third birthday. Support of h2 in browsers and Web servers is pretty good. Nowadays, with a TLS certificate at hand using h2 is not much more effort than flipping a switch. All major Web servers like NginxApache httpd or IIS have built-in support. Auxiliary software like HAProxy or Varnish/Hitch do so, too.

That’s great! We get multiplexing, stream priorities, HPACK and all the other h2 awesomeness we see in slide decks – whatever they do…

A tale of a waterfall chart and some insights in how HTTP/2 really works.

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