Elliotte Rusty Harold believes REST has failed because browsers don’t support (and standards don’t require them to support) PUT and DELETE. This is a very interesting post, especially because there is little doubt that Elliotte actually “gets” REST; his opinion is not based on plain misunderstanding. The one thing he ignores, though, is that REST principles are perfectly usable for app-to-app communication, where all verbs can be used without a problem.