how to use CORS?

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Description

I'm using it this way now but I'd like confirmation that this is the way :)

```rust
#[event(fetch)]
pub async fn main(req: Request, env: Env, _ctx: worker::Context) -> Result {
log_request(&req);

// Optionally, get more helpful error messages written to the console in the case of a panic.
utils::set_panic_hook();

// CORS
let cors = Cors::default()
.with_max_age(86400)
.with_origins(vec!["*"])
.with_methods(vec![
Method::Get,
Method::Head,
Method::Post,
Method::Options,
]);

// TRUNCATED...

let router = Router::new();

router
// TRUNCATED...
.run(req, env)
.await?
.with_cors(&cors)
```