I've spent a fair amount of time dealing with HTTP, and am currently digging into it a bit again particularly given that most of my in-depth hands-on experience with the details was during the period when HTTP/2 was displacing SPDY and therefore I was fairly eagerly awaiting some of HTTP/2's features but did not have the opportunity to acquire much practical experience. As I'm again in a position where such knowledge can yield substantive benefits, I need to brush up on HTTP/2 and HTTP/3.