Attribute Macro controller 

#[controller]

Declares the path prefix for a controller type.

#[controller] is valid on structs that own HTTP handler methods. It is metadata-generating behavior by itself: it records the controller prefix and exposes controller metadata used by #[routes], CLI route inspection, and OpenAPI tooling.

Basic syntax:

#[controller("/users")]
struct UsersController {
    service: UsersService,
}

#[controller("/users")] combines with route methods inside a #[routes] impl block. The final route path is the controller prefix plus each method’s route path, for example "/users" and "/:id" become "/users/:id". Common errors are missing the string literal path, using an empty dynamic segment such as "/:", or expecting this macro alone to register Tower routes. Executable routing is generated by #[routes].