The article says "most client and server applications don’t support all verbs or response codes" which, in my experience, is not true. There are some but it's definitely not "most". For one, if you're writing both sides, don't build on client or server software that sucks. Sure, HTML forms don't support PUT and DELETE but how often to you use HTML forms instead of ajax requests (which do support those methods)? And, if you subscribe to a little bit of CQRS and Event Sourcing ideas, PUT and DELETE don't really make sense since you should really be POSTing commands to do those things. Where they do make sense is when manipulating files directly which I don't think comes up much these days.