perf: large cache time on immutable hashed statics

src/main.rs

@@ -12,7 +12,9 @@ use std::sync::{Arc, RwLock};
 use tokio::net::TcpListener;
 use tokio::signal;
 use tokio::task::AbortHandle;
+use tower::ServiceBuilder;
 use tower_http::services::{ServeDir, ServeFile};
+use tower_http::set_header::SetResponseHeaderLayer;
 use tower_sessions::{ExpiredDeletion, Expiry, SessionManagerLayer, cookie::Key};
 use tower_sessions_sqlx_store::SqliteStore;
 use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
@@ -182,7 +184,15 @@ async fn serve(port: &u32) -> Result<(), anyhow::Error> {
         .route_layer(login_required!(Backend, login_url = "/login"))
         .merge(auth::router())
         .merge(ics::router())
-        .nest_service("/static", ServeDir::new("./hashed_static"))
+        .nest_service(
+            "/static",
+            ServiceBuilder::new()
+                .layer(SetResponseHeaderLayer::overriding(
+                    http::header::CACHE_CONTROL,
+                    http::header::HeaderValue::from_static("public, max-age=31536000, immutable"),
+                ))
+                .service(ServeDir::new("./hashed_static")),
+        )
         .nest_service(
             "/favicon.ico",
             ServeFile::new(format!("./hashed_static/{}", asset!("favicon.ico"))),