Because `ActionDispatch::SSL` is included higher up in the middleware stack than `ActionDispatch::ShowExceptions`, it should ideally not be raising any exceptions.

In this case, `ActionDispatch::Request#{get,head}?` are called, which check if the HTTP method is valid. If it isn't, `ActionController::UnknownHttpMethod` is raised. Instead of calling the Rack-provided predicate methods, we leverage `raw_request_method`.