I think it was the change from :body-params to :parameters {:body}, and making sure the web-server was fully reloaded in the REPL

[metosin/reitit "0.2.8"] is out with the following: • support for 3rd party spec coercion error printers • create-swagger-handler works with ring-async (macchiato/node.js) • support for composing middleware & interceptor transformations