v0.31.5

src/runtime/tests.rs

@@ -69,6 +69,30 @@ mod cache_revision_tests {
             CacheInvalidation::None
         ));
 
+        for label in ["http2", "http3"] {
+            let mut protocol_only = base.clone();
+            if label == "http2" {
+                protocol_only.vhosts[0].http2_enabled = !base.vhosts[0].http2_enabled;
+            } else {
+                protocol_only.vhosts[0].http3_enabled = !base.vhosts[0].http3_enabled;
+            }
+            // The effective configuration really changes, but the cache key
+            // does not. This must hold for both toggling directions.
+            assert_ne!(
+                (protocol_only.vhosts[0].http2_enabled, protocol_only.vhosts[0].http3_enabled),
+                (base.vhosts[0].http2_enabled, base.vhosts[0].http3_enabled),
+                "{label} toggle did not change a transport switch"
+            );
+            assert_eq!(cache_revision(&protocol_only), identity, "{label} rotated cache");
+            assert!(matches!(cache_invalidation(&base, &protocol_only), CacheInvalidation::None));
+            assert!(matches!(cache_invalidation(&protocol_only, &base), CacheInvalidation::None));
+        }
+        let mut both_protocols = base.clone();
+        both_protocols.vhosts[0].http2_enabled = !base.vhosts[0].http2_enabled;
+        both_protocols.vhosts[0].http3_enabled = !base.vhosts[0].http3_enabled;
+        assert_eq!(cache_revision(&both_protocols), identity);
+        assert!(matches!(cache_invalidation(&base, &both_protocols), CacheInvalidation::None));
+
         let mut vhost_diagnostics = base.clone();
         vhost_diagnostics.vhosts[0].cache.expose_only_hits = Some(true);
         assert_eq!(cache_revision(&vhost_diagnostics), identity);

src/runtime/types.rs

@@ -117,6 +117,11 @@ fn cache_revision(config: &config::Config) -> u64 {
     let mut vhosts = config.vhosts.clone();
     for vhost in &mut vhosts {
         vhost.cache.expose_only_hits = None;
+        // Frontend ALPN/QUIC switches decide how a client reaches a vhost,
+        // not which representation the origin returns. Hot and cold entries
+        // must survive HTTP/2 or HTTP/3 opt-in/out saves.
+        vhost.http2_enabled = true;
+        vhost.http3_enabled = true;
     }
     let encoded = serde_json::to_vec(&(
         &cache,