Expire images after 1 day

src/net/http.rs

@@ -95,11 +95,14 @@ where
 }
 
 /// Converts the URL to expiration timestamp.
-fn http_url_cache_expires(url: &str) -> i64 {
+fn http_url_cache_expires(url: &str, mimetype: Option<&str>) -> i64 {
     let now = time();
     if url.ends_with(".xdc") {
         // WebXDCs expire in 5 weeks.
         now + 3600 * 24 * 35
+    } else if mimetype.is_some_and(|s| s.starts_with("image/")) {
+        // Cache images for 1 day.
+        now + 3600 * 24
     } else {
         // Cache everything else for 1 hour.
         now + 3600
@@ -122,7 +125,7 @@ async fn http_cache_put(context: &Context, url: &str, response: &Response) -> Re
              VALUES (?, ?, ?, ?, ?)",
             (
                 url,
-                http_url_cache_expires(url),
+                http_url_cache_expires(url, response.mimetype.as_deref()),
                 blob.as_name(),
                 response.mimetype.as_deref().unwrap_or_default(),
                 response.encoding.as_deref().unwrap_or_default(),
@@ -157,6 +160,7 @@ async fn http_cache_get(context: &Context, url: &str) -> Result<Option<Response>
     let blob_abs_path = blob_object.to_abs_path();
     let blob = fs::read(blob_abs_path).await?;
 
+    let expires = http_url_cache_expires(url, mimetype.as_deref());
     let response = Response {
         blob,
         mimetype,
@@ -168,7 +172,7 @@ async fn http_cache_get(context: &Context, url: &str) -> Result<Option<Response>
         .sql
         .execute(
             "UPDATE http_cache SET expires=? WHERE url=?",
-            (http_url_cache_expires(url), url),
+            (expires, url),
         )
         .await?;