The entire concept of status codes is odd to me. Responses already have arbitrary string-keyed headers. Isn't that good enough? Why have an extra blessed "Statu

The entire concept of status codes is odd to me. Responses already have arbitrary string-keyed headers. Isn't that good enough? Why have an extra blessed "Status" key with special syntax? If there was a useful bit of information to convey (I also don't see any for 428), what's wrong with adding a new header?