From c83c43194b28c548b50ea506cc464a0a3e21f802 Mon Sep 17 00:00:00 2001
From: Juergen Kunz <juergen@foss.global>
Date: Mon, 23 Mar 2026 11:11:55 +0000
Subject: [PATCH] fix(rustproxy-http): include the upstream request URL when
 caching H3 Alt-Svc discoveries

---
 changelog.md                                    |  6 ++++++
 rust/crates/rustproxy-http/src/proxy_service.rs | 12 +++++++++---
 ts/00_commitinfo_data.ts                        |  2 +-
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/changelog.md b/changelog.md
index 7214e3a..311927f 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 2026-03-23 - 26.2.1 - fix(rustproxy-http)
+include the upstream request URL when caching H3 Alt-Svc discoveries
+
+- Tracks the request path that triggered Alt-Svc discovery in connection activity state
+- Adds request URL context to Alt-Svc debug logging and protocol cache insertion reasons for better traceability
+
 ## 2026-03-23 - 26.2.0 - feat(protocol-cache)
 add sliding TTL re-probing and eviction for backend protocol detection
 
diff --git a/rust/crates/rustproxy-http/src/proxy_service.rs b/rust/crates/rustproxy-http/src/proxy_service.rs
index b1e7e28..0d29774 100644
--- a/rust/crates/rustproxy-http/src/proxy_service.rs
+++ b/rust/crates/rustproxy-http/src/proxy_service.rs
@@ -47,6 +47,8 @@ pub struct ConnActivity {
     /// checks the backend's original response headers for Alt-Svc before our
     /// ResponseFilter injects its own. None when not in auto-detect mode or after H3 failure.
     alt_svc_cache_key: Option<crate::protocol_cache::ProtocolCacheKey>,
+    /// The upstream request path that triggered Alt-Svc discovery. Logged for traceability.
+    alt_svc_request_url: Option<String>,
 }
 
 impl ConnActivity {
@@ -58,6 +60,7 @@ impl ConnActivity {
             start: std::time::Instant::now(),
             active_requests: None,
             alt_svc_cache_key: None,
+            alt_svc_request_url: None,
         }
     }
 }
@@ -371,7 +374,7 @@ impl HttpProxyService {
             let cn = cancel_inner.clone();
             let la = Arc::clone(&la_inner);
             let st = start;
-            let ca = ConnActivity { last_activity: Arc::clone(&la_inner), start, active_requests: Some(Arc::clone(&ar_inner)), alt_svc_cache_key: None };
+            let ca = ConnActivity { last_activity: Arc::clone(&la_inner), start, active_requests: Some(Arc::clone(&ar_inner)), alt_svc_cache_key: None, alt_svc_request_url: None };
             async move {
                 let req = req.map(|body| BoxBody::new(body));
                 let result = svc.handle_request(req, peer, port, cn, ca).await;
@@ -775,6 +778,7 @@ impl HttpProxyService {
         // the backend's original Alt-Svc header before ResponseFilter injects our own.
         if is_auto_detect_mode {
             conn_activity.alt_svc_cache_key = Some(protocol_cache_key.clone());
+            conn_activity.alt_svc_request_url = Some(upstream_path.to_string());
         }
 
         // --- H3 path: try QUIC connection before TCP ---
@@ -1979,8 +1983,10 @@ impl HttpProxyService {
         if let Some(ref cache_key) = conn_activity.alt_svc_cache_key {
             if let Some(alt_svc) = resp_parts.headers.get("alt-svc").and_then(|v| v.to_str().ok()) {
                 if let Some(h3_port) = parse_alt_svc_h3_port(alt_svc) {
-                    debug!(h3_port, "Backend advertises H3 via Alt-Svc");
-                    self.protocol_cache.insert_h3(cache_key.clone(), h3_port, "Alt-Svc response header");
+                    let url = conn_activity.alt_svc_request_url.as_deref().unwrap_or("-");
+                    debug!(h3_port, url, "Backend advertises H3 via Alt-Svc");
+                    let reason = format!("Alt-Svc response header ({})", url);
+                    self.protocol_cache.insert_h3(cache_key.clone(), h3_port, &reason);
                 }
             }
         }
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 01c07f1..10d53ab 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartproxy',
-  version: '26.2.0',
+  version: '26.2.1',
   description: 'A powerful proxy package with unified route-based configuration for high traffic management. Features include SSL/TLS support, flexible routing patterns, WebSocket handling, advanced security options, and automatic ACME certificate management.'
 }