This is the major knock on HTTP2. It's entirely focused on hacking around transport layer issues while keeping TCP intact and has shied away from fixing real and serious problems with the HTTP protocol itself. Here's a quote from the HTTP2 FAQ: ( https://http2.github.io/faq/#can-http2-make-cookies-or-other... )

"In particular, we want to be able to translate from HTTP/1 to HTTP/2 and back with no loss of information. If we started “cleaning up” the headers (and most will agree that HTTP headers are pretty messy), we’d have interoperability problems with much of the existing Web."

Pretty disappointing really. It took 15 years of haggling and we ended up with precisely the old protocol but now in a new, improved binary format with multiplexing.