cache the homepage for a minute

src/web/cache.rs

@@ -6,6 +6,7 @@ use http::{header::CACHE_CONTROL, HeaderValue};
 use std::sync::Arc;
 
 pub static NO_CACHING: HeaderValue = HeaderValue::from_static("max-age=0");
+pub static SHORT: HeaderValue = HeaderValue::from_static("max-age=60");
 
 pub static NO_STORE_MUST_REVALIDATE: HeaderValue =
     HeaderValue::from_static("no-cache, no-store, must-revalidate, max-age=0");
@@ -24,7 +25,12 @@ pub enum CachePolicy {
     /// * enforce revalidation
     /// * never store
     NoStoreMustRevalidate,
-    /// cache forever in browser & CDN.  
+    /// cache for a short time in the browser & CDN.
+    /// right now: one minute.
+    /// Can be used when the content can be a _little_ outdated,
+    /// while protecting agains spikes in traffic.
+    ShortInCdnAndBrowser,
+    /// cache forever in browser & CDN.
     /// Valid when you have hashed / versioned filenames and every rebuild would
     /// change the filename.
     ForeverInCdnAndBrowser,
@@ -46,6 +52,7 @@ impl CachePolicy {
         match *self {
             CachePolicy::NoCaching => Some(NO_CACHING.clone()),
             CachePolicy::NoStoreMustRevalidate => Some(NO_STORE_MUST_REVALIDATE.clone()),
+            CachePolicy::ShortInCdnAndBrowser => Some(SHORT.clone()),
             CachePolicy::ForeverInCdnAndBrowser => Some(FOREVER_IN_CDN_AND_BROWSER.clone()),
             CachePolicy::ForeverInCdn => {
                 if config.cache_invalidatable_responses {

src/web/releases.rs

@@ -30,6 +30,8 @@ use std::sync::Arc;
 use tracing::{debug, warn};
 use url::form_urlencoded;
 
+use super::cache::CachePolicy;
+
 /// Number of release in home page
 const RELEASES_IN_HOME: i64 = 15;
 /// Releases in /releases page
@@ -271,6 +273,7 @@ struct HomePage {
 
 impl_axum_webpage! {
     HomePage = "core/home.html",
+    cache_policy = |_| CachePolicy::ShortInCdnAndBrowser,
 }
 
 pub(crate) async fn home_page(mut conn: DbConnection) -> AxumResult<impl IntoResponse> {
@@ -719,7 +722,8 @@ mod tests {
     use super::*;
     use crate::registry_api::CrateOwner;
     use crate::test::{
-        assert_redirect, assert_redirect_unchecked, assert_success, wrapper, TestFrontend,
+        assert_cache_control, assert_redirect, assert_redirect_unchecked, assert_success, wrapper,
+        TestFrontend,
     };
     use anyhow::Error;
     use chrono::{Duration, TimeZone};
@@ -1484,6 +1488,8 @@ mod tests {
             seen.insert("".to_owned());
 
             let resp = web.get("").send()?;
+            assert_cache_control(&resp, CachePolicy::ShortInCdnAndBrowser, &env.config());
+
             assert!(resp.status().is_success());
 
             let html = kuchikiki::parse_html().one(resp.text()?);

src/web/rustdoc.rs

@@ -1013,7 +1013,7 @@ mod test {
                 .build_result_failed()
                 .create()?;
             let web = env.frontend();
-            assert_success_cached("/", web, CachePolicy::NoCaching, &env.config())?;
+            assert_success_cached("/", web, CachePolicy::ShortInCdnAndBrowser, &env.config())?;
             assert_success_cached(
                 "/crate/buggy/0.1.0/",
                 web,