Because you should never, never, never create your own verbs. The main reason APIs have become ubiquitous is that we have a shared understanding that follows u

Because you should never, never, never create your own verbs. The main reason APIs have become ubiquitous is that we have a shared understanding that follows us from API to API. That includes the concept of verbs, response codes, and how to interact with the nouns/resources. If you add verbs, you're breaking that agreement. Also, from a technical perspective, some of the internet infrastructure - servers, routers, etc - drop things they don't recognize. Heroku for years was dropping the PATCH verb despite recommending its use for customers' APIs.. and PATCH is in one of the specifications! Imagine what would happen to your custom verb. Don't create your own. Stick to the standards.