Function head 

pub fn head<St: State, U: 'static>() -> Route<St, U>

Create route with HEAD method guard.

use ntex::web;

let app = web::App::default().service(
    web::resource("/{project_id}")
        .route(web::head().to(async || { web::HttpResponse::Ok() }))
);

In the above example, one HEAD route gets added:

• /{project_id}