diff --git a/scripts/check-pingora-gateway-smoke.mjs b/scripts/check-pingora-gateway-smoke.mjs
index a9b69e170..4428baf8c 100644
--- a/scripts/check-pingora-gateway-smoke.mjs
+++ b/scripts/check-pingora-gateway-smoke.mjs
@@ -383,6 +383,8 @@ async function startApiMock() {
   const state = {
     requests: [],
     releaseHold: undefined,
+    releaseAbortHold: undefined,
+    closedBeforeResponse: [],
   };
   const server = http.createServer(async (request, response) => {
     let body;
@@ -406,11 +408,20 @@ async function startApiMock() {
       headers: request.headers,
       body,
     });
+    response.on('close', () => {
+      if (!response.writableEnded) {
+        state.closedBeforeResponse.push(request.url || '');
+      }
+    });
 
     if (request.url?.endsWith('/hold')) {
       await new Promise((resolve) => {
         state.releaseHold = resolve;
       });
+    } else if (request.url?.endsWith('/abort-hold')) {
+      await new Promise((resolve) => {
+        state.releaseAbortHold = resolve;
+      });
     } else if (request.url?.endsWith('/upstream-close')) {
       request.socket.destroy();
       return;
@@ -1006,6 +1017,7 @@ async function runSmokeCases(
   await expectChunkedLimit(baseUrl, '/api/upload');
 
   await expectConcurrencyLimit(baseUrl, api);
+  await expectDownstreamAbortCancelsUpstream(baseUrl, api);
 
   const rateLimitHeaders = { 'X-Forwarded-For': '203.0.113.13' };
   const beforeRateLimitRequestCount = api.state.requests.length;
@@ -1695,6 +1707,27 @@ async function expectConcurrencyLimit(baseUrl, api) {
   }
 }
 
+async function expectDownstreamAbortCancelsUpstream(baseUrl, api) {
+  console.log('[pingora-gateway-smoke] 下游中断传播到 API 上游');
+  const route = '/api/abort-hold';
+  const hold = await openRawHttpRequest(`${baseUrl}${route}`, {
+    'X-Forwarded-For': '203.0.113.16',
+  });
+
+  try {
+    await waitForCondition(
+      () => typeof api.state.releaseAbortHold === 'function',
+    );
+    hold.socket.destroy();
+    await hold.done.catch(() => undefined);
+    await waitForCondition(() =>
+      api.state.closedBeforeResponse.includes(route),
+    );
+  } finally {
+    api.state.releaseAbortHold?.();
+  }
+}
+
 async function expectWebSocketUpgrade(baseUrl, route, spacetime) {
   console.log('[pingora-gateway-smoke] SpacetimeDB WebSocket Upgrade');
   const url = new URL(route, baseUrl);
diff --git a/server-rs/crates/api-server/src/editor_agent/api.rs b/server-rs/crates/api-server/src/editor_agent/api.rs
index e26bd6b69..65a043142 100644
--- a/server-rs/crates/api-server/src/editor_agent/api.rs
+++ b/server-rs/crates/api-server/src/editor_agent/api.rs
@@ -443,6 +443,30 @@ fn editor_agent_attachment_requests_match(
 mod tests {
     use super::*;
     use shared_contracts::editor_agent::{EditorAgentAttachmentRef, EditorAgentAttachmentSource};
+    use std::sync::Arc;
+    use tokio::sync::{Mutex as AsyncMutex, Semaphore};
+
+    #[derive(Clone)]
+    struct HttpAbortTestState {
+        handler_lock: Arc<AsyncMutex<()>>,
+        handler_started: Arc<Semaphore>,
+        handler_dropped: Arc<Semaphore>,
+    }
+
+    struct HttpAbortDropNotice(Arc<Semaphore>);
+
+    impl Drop for HttpAbortDropNotice {
+        fn drop(&mut self) {
+            self.0.add_permits(1);
+        }
+    }
+
+    async fn pending_http_abort_test_handler(State(state): State<HttpAbortTestState>) {
+        let _handler_lock_guard = state.handler_lock.lock().await;
+        let _drop_notice = HttpAbortDropNotice(state.handler_dropped.clone());
+        state.handler_started.add_permits(1);
+        std::future::pending::<()>().await;
+    }
 
     fn attachment(reference_id: impl Into<String>) -> EditorAgentAttachmentRef {
         EditorAgentAttachmentRef {
@@ -590,6 +614,69 @@ mod tests {
             "美术 Agent 规划失败：规划总时长已达到 18 分钟安全上限"
         );
     }
+
+    #[tokio::test]
+    async fn dropping_an_http_request_drops_the_handler_and_releases_its_lock() {
+        let state = HttpAbortTestState {
+            handler_lock: Arc::new(AsyncMutex::new(())),
+            handler_started: Arc::new(Semaphore::new(0)),
+            handler_dropped: Arc::new(Semaphore::new(0)),
+        };
+        let router = axum::Router::new()
+            .route(
+                "/pending",
+                axum::routing::post(pending_http_abort_test_handler),
+            )
+            .with_state(state.clone());
+        let listener = tokio::net::TcpListener::bind("127.0.0.1:0")
+            .await
+            .expect("test listener should bind");
+        let address = listener
+            .local_addr()
+            .expect("test listener should have an address");
+        let server = tokio::spawn(async move {
+            axum::serve(listener, router)
+                .await
+                .expect("test server should run");
+        });
+        let request = tokio::spawn(async move {
+            reqwest::Client::builder()
+                .pool_max_idle_per_host(0)
+                .build()
+                .expect("test client should build")
+                .post(format!("http://{address}/pending"))
+                .send()
+                .await
+        });
+
+        tokio::time::timeout(
+            Duration::from_secs(2),
+            state.handler_started.clone().acquire_owned(),
+        )
+        .await
+        .expect("handler should start before cancellation")
+        .expect("handler start semaphore should stay open")
+        .forget();
+
+        request.abort();
+        let _ = request.await;
+
+        tokio::time::timeout(
+            Duration::from_secs(2),
+            state.handler_dropped.clone().acquire_owned(),
+        )
+        .await
+        .expect("HTTP cancellation should drop the handler")
+        .expect("handler drop semaphore should stay open")
+        .forget();
+        let _released_lock =
+            tokio::time::timeout(Duration::from_secs(2), state.handler_lock.lock())
+                .await
+                .expect("HTTP cancellation should release the handler lock");
+
+        server.abort();
+        let _ = server.await;
+    }
 }
 fn editor_agent_system_prompt() -> &'static str {
     r#"