feat: Set Cache-Control header on responses

src/main.rs

@@ -8,7 +8,7 @@ use ::typst::syntax::VirtualPath;
 use axum::{
     Router,
     extract::{Path, State},
-    http::StatusCode,
+    http::{HeaderValue, StatusCode, header::CACHE_CONTROL},
     response::{Html, IntoResponse, Response},
     routing::get,
 };
@@ -17,6 +17,7 @@ use itertools::Itertools;
 use tower_http::{
     compression::CompressionLayer,
     services::{ServeDir, ServeFile},
+    set_header::SetResponseHeaderLayer,
     trace::TraceLayer,
 };
 use tracing::{Level, info};
@@ -97,14 +98,20 @@ async fn main() {
     let mut favicon = state.config.get_full_assets_path();
     favicon.push(PathBuf::from("favicon.svg"));
 
+    let assets_service = ServeDir::new(state.config.get_full_assets_path());
+
     let app = Router::new()
         .route("/", get(root_handler))
         .route("/{*path}", get(typst_handler))
         .route_service("/favicon.ico", ServeFile::new(favicon))
-        .nest_service("/assets", ServeDir::new(&state.config.assets_root))
+        .nest_service("/assets", assets_service)
         .with_state(state.clone())
         .layer(TraceLayer::new_for_http())
-        .layer(CompressionLayer::new());
+        .layer(CompressionLayer::new())
+        .layer(SetResponseHeaderLayer::overriding(
+            CACHE_CONTROL,
+            HeaderValue::from_static("public, max-age=86400, immutable"),
+        ));
 
     let socket = SocketAddrV4::new(Ipv4Addr::new(0, 0, 0, 0), state.config.port);
     info!("Serving Karnaugh on socket {}", socket);