From 77c4ed8b706813e5e2dc3836fea73256c449e793 Mon Sep 17 00:00:00 2001
From: shiiwuz <shiiwuz@users.noreply.github.com>
Date: Tue, 10 Feb 2026 20:04:32 +0800
Subject: [PATCH] Sticky session: fallback to prompt_cache_key

---
 src/routes/openaiRoutes.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/routes/openaiRoutes.js b/src/routes/openaiRoutes.js
index 363255fc..b912a253 100644
--- a/src/routes/openaiRoutes.js
+++ b/src/routes/openaiRoutes.js
@@ -240,11 +240,13 @@ const handleResponses = async (req, res) => {
     }
 
     // 从请求头或请求体中提取会话 ID
+    // NOTE: For some clients, prompt_cache_key is the only stable per-session key.
     const sessionId =
       req.headers['session_id'] ||
       req.headers['x-session-id'] ||
       req.body?.session_id ||
       req.body?.conversation_id ||
+      req.body?.prompt_cache_key ||
       null
 
     sessionHash = sessionId ? crypto.createHash('sha256').update(sessionId).digest('hex') : null