Rust is not pretty, but it's not that bad:

    use actix_web::{get, web, App, HttpServer, Responder};

    #[get("/hello/{name}")]
    async fn greet(name: web::Path<String>) -> impl Responder {
        format!("Hello {name}!")
    }

    #[actix_web::main]
    async fn main() -> std::io::Result<()> {
        HttpServer::new(|| {
            App::new().service(greet)
        })
        .bind(("127.0.0.1", 8080))?
        .run()
        .await
    }

Of course, anything with brackets can be improved ! ;-)

    from sanic import Sanic
    from sanic.request import Request
    from sanic.response import text, HTTPResponse

    app = Sanic("MyHelloWorldApp")

    @app.get("/hello/<name>")
    async def hello_world(request: Request, name: str) -> HTTPResponse:
        return text(f"Hello, {name}")