I have been requested to review this document as the ARTART reviewer.

Congratulations on this massive piece of work.  It's valuable and important and clearly represents a lot of time for a lot of people!  I read the whole thing, though I admit I skimmed over the references and appendix information since I assume they were software generated.

I'm afraid I probably missed heaps of stuff when reading this document, the reverse bikeshed problem, this thing is a nuclear reactor and I'm sure the people who wrote it are very smart and understand what they are doing!  I found it quite repetitive in parts, particularly when it's using boilerplate for "you really shouldn't do this and it won't interoperate but maybe you have an agreement between the client and the server to do it anyway" - but I understand the reason for doing so to make each section self-contained.

Thanks for doing this important work - I learned a fair bit about the history of HTTP and some of the interesting edge cases reading this.