This is nothing to do with HTTP/2. This is just keep-alive behaviour, which applies to HTTP/1.1 just as much as HTTP/2. Also the 6 is the maximum number of HTT

This is nothing to do with HTTP/2. This is just keep-alive behaviour, which applies to HTTP/1.1 just as much as HTTP/2. Also the 6 is the maximum number of HTTP/1.1 connections most browser configurations will open per origin; HTTP/2 lets you have as many streams open on one connection as you like (up to 2³⁰ or 2³¹ if my memory serves me, but a billion ought to be enough for anyone).