Macro end 

macro_rules! end {
    () => { ... };
}

This macro is just a syntactic sugar over the Ok(MiddlewareResult::End)

Behavior: Instantly halts all further processing (skipping remaining middleware and routing) and sends the current state of the Response to the client.
Warning: Ensure you have populated the Response (status, body, etc.) before calling end!. Otherwise it will send a empty Response with a 200 code.