Add serve function and remove Server re-export (#1868)

examples/validator/src/main.rs

@@ -19,8 +19,8 @@ use axum::{
     Router,
 };
 use serde::{de::DeserializeOwned, Deserialize};
-use std::net::SocketAddr;
 use thiserror::Error;
+use tokio::net::TcpListener;
 use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 use validator::Validate;
 
@@ -38,13 +38,9 @@ async fn main() {
     let app = Router::new().route("/", get(handler));
 
     // run it
-    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
-    tracing::debug!("listening on {}", addr);
-
-    axum::Server::bind(&addr)
-        .serve(app.into_make_service())
-        .await
-        .unwrap();
+    let listener = TcpListener::bind("127.0.0.1:3000").await.unwrap();
+    tracing::debug!("listening on {}", listener.local_addr().unwrap());
+    axum::serve(listener, app).await.unwrap();
 }
 
 #[derive(Debug, Deserialize, Validate)]