From 80c0b06980d9b6bd2d32a48708bfee278b50f158 Mon Sep 17 00:00:00 2001
From: Songchao Wang <songchaow@outlook.com>
Date: Wed, 10 Jun 2026 06:01:17 +0800
Subject: [PATCH] feat: add X-Session-Id header for proxy cache routing
 affinity (#31511)

---
 packages/opencode/src/session/llm/request.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/opencode/src/session/llm/request.ts b/packages/opencode/src/session/llm/request.ts
index 0996be0f7..2785d9852 100644
--- a/packages/opencode/src/session/llm/request.ts
+++ b/packages/opencode/src/session/llm/request.ts
@@ -185,6 +185,7 @@ export const prepare = Effect.fn("LLMRequestPrep.prepare")(function* (input: Pre
           }
         : {
             "x-session-affinity": input.sessionID,
+            "X-Session-Id": input.sessionID,
             ...(input.parentSessionID ? { "x-parent-session-id": input.parentSessionID } : {}),
             "User-Agent": USER_AGENT,
           }),