From f4ecfb2dff83d5d067e18482aeb27d7bd478c123 Mon Sep 17 00:00:00 2001
From: Atirna <288419661+atirna@users.noreply.github.com>
Date: Wed, 2 Sep 2026 07:56:15 +0530
Subject: [PATCH] fix(http3): update cached Alt-Svc support

---
 impit/src/http3.rs | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/impit/src/http3.rs b/impit/src/http3.rs
index 0cefa059..7391460c 100644
--- a/impit/src/http3.rs
+++ b/impit/src/http3.rs
@@ -78,10 +78,25 @@ impl H3Engine {
 
     pub async fn set_h3_support(&self, host: &String, supports_h3: bool) {
         let mut cache = self.h3_alt_svc.write().await;
-        if cache.contains_key(host) {
-            return;
-        }
-
         cache.insert(host.to_owned(), supports_h3);
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test]
+    async fn alt_svc_discovery_updates_cached_h3_support() {
+        let engine = H3Engine::init().await;
+        let host = "example.com".to_string();
+        let other_host = "other.example.com".to_string();
+
+        engine.set_h3_support(&host, false).await;
+        engine.set_h3_support(&other_host, false).await;
+        engine.set_h3_support(&host, true).await;
+
+        assert!(engine.host_supports_h3(&host).await);
+        assert!(!engine.host_supports_h3(&other_host).await);
+    }
+}