The OPTIONS method is not widely used in REST context.
| OPTIONS | Client-server concept |
| OPTIONS method and potential | http://zacstewart.com/2012/04/14/http-options-method.html |
| OPTIONS is promising but not used | http://restfulwebapis.com/RESTful_Web_Services/ (p.66-67) |
| OPTIONS in RFC2616 | https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html |
| OPTIONS in Stackoverflow | https://stackoverflow.com/questions/6660019/restful-api-methods-head-options |
| Nobody uses OPTIONS | https://restapilinks.com/wp-content/uploads/2021/04/RESTful_Web_APIs.pdf(p.40) |
