To put the comment and its author in context, Poul-Henning Kamp is the main developer of Varnish, a widely used high-performance standard-compliant HTTP cache.

PHK has experience of HTTP both from the server point of view (the main job of Varnish is acting as a fast HTTP server) and from client point of view (Varnish acts as client to the slow upstream HTTP servers).

As a side note, he also refrained for years from adding TLS support to Varnish after his review of OpenSSL and SSL in general (see https://www.varnish-cache.org/docs/trunk/phk/ssl.html ).