Connecting Html file in rocket-rust. How can i connect my html file in through core

fn make_cors() -> Cors {
    let allowed_origins = AllowedOrigins::some_exact(&[
        "http://127.0.0.1:5500/Html_Rust_server/index.html",
        // allow request from these
                                          // allow from local machine
    ]);
    CorsOptions {
        allowed_origins,
        allowed_methods: vec![Method::Get, Method::Post, Method::Put, Method::Delete]
            .into_iter()
            .map(From::from)
            .collect(),
        allowed_headers: AllowedHeaders::some(&[
            "Authorization",
            "Accept",
            "Access-Control-Allow-Origin",
        ]),
        allow_credentials: true, // without user name and password
        ..Default::default()
    }
    .to_cors() // convert to cross origin
    .expect("Error while building the Cros")
}