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

examples/graceful-shutdown/Cargo.toml

@@ -6,4 +6,5 @@ publish = false
 
 [dependencies]
 axum = { path = "../../axum" }
+hyper = { version = "0.14", features = ["full"] }
 tokio = { version = "1.0", features = ["full"] }

examples/graceful-shutdown/src/main.rs

@@ -17,7 +17,7 @@ async fn main() {
     // run it
     let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
     println!("listening on {}", addr);
-    axum::Server::bind(&addr)
+    hyper::Server::bind(&addr)
         .serve(app.into_make_service())
         .with_graceful_shutdown(shutdown_signal())
         .await