>The so-called "head-of-line blocking" problem seems to be restricted to "complex" websites that use resources from multiple hosts, especially trackers and ad s

>The so-called "head-of-line blocking" problem seems to be restricted to "complex" websites that use resources from multiple hosts, especially trackers and ad servers. Those are often websites with lots of advertising, distractions and annoyances. Multiple hosts? You mean like in a app level proxy so its actually over the same connection? I think its more relevant for multiple multiplexed requests to an API server in the B2B setting. Now the connection isn't bogged down by slow responses.