v0.28.0

src/cache/model/entry.rs

@@ -126,6 +126,15 @@ impl Settings {
             (1..=64).contains(&self.proactive_refresh_max_inflight),
             "cache.proactive_refresh_max_inflight must be 1..64"
         );
+        if let Some(value) = &self.via_header {
+            ensure!(
+                !value.is_empty()
+                    && value.len() <= 256
+                    && value.bytes().all(|byte| byte >= 0x20 && byte != 0x7f)
+                    && value.parse::<HeaderValue>().is_ok(),
+                "cache.via_header must be a valid 1..256 byte HTTP header value"
+            );
+        }
         Ok(())
     }
     pub fn active_for(&self, route: Option<bool>) -> bool {
@@ -173,6 +182,12 @@ impl Settings {
         if !self.enabled {
             return;
         }
+        if let Some(value) = &self.via_header {
+            headers.append(
+                http::header::VIA,
+                value.parse::<HeaderValue>().expect("validated cache Via header"),
+            );
+        }
         if self.expose_status {
             headers.insert("x-cache", HeaderValue::from_static(outcome));
         }