From fb265f2b1f970122883e538d0967a844462d336c Mon Sep 17 00:00:00 2001
From: Henry Li <henry1943@163.com>
Date: Mon, 19 Jan 2026 21:51:40 +0800
Subject: [PATCH] feat: support NEXT_PUBLIC_LANGGRAPH_BASE_URL

---
 frontend/src/core/api/api-client.ts | 4 ++--
 frontend/src/core/config/index.ts   | 8 ++++++++
 frontend/src/env.js                 | 2 ++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/frontend/src/core/api/api-client.ts b/frontend/src/core/api/api-client.ts
index 0672d10..8e50472 100644
--- a/frontend/src/core/api/api-client.ts
+++ b/frontend/src/core/api/api-client.ts
@@ -2,12 +2,12 @@
 
 import { Client as LangGraphClient } from "@langchain/langgraph-sdk/client";
 
-import { getBackendBaseURL } from "../config";
+import { getLangGraphBaseURL } from "../config";
 
 let _singleton: LangGraphClient | null = null;
 export function getAPIClient(): LangGraphClient {
   _singleton ??= new LangGraphClient({
-    apiUrl: getBackendBaseURL(),
+    apiUrl: getLangGraphBaseURL(),
   });
   return _singleton;
 }
diff --git a/frontend/src/core/config/index.ts b/frontend/src/core/config/index.ts
index 49ea851..c2cf885 100644
--- a/frontend/src/core/config/index.ts
+++ b/frontend/src/core/config/index.ts
@@ -7,3 +7,11 @@ export function getBackendBaseURL() {
     return "http://localhost:8000";
   }
 }
+
+export function getLangGraphBaseURL() {
+  if (env.NEXT_PUBLIC_LANGGRAPH_BASE_URL) {
+    return env.NEXT_PUBLIC_LANGGRAPH_BASE_URL;
+  } else {
+    return getBackendBaseURL();
+  }
+}
diff --git a/frontend/src/env.js b/frontend/src/env.js
index c32228b..80d9165 100644
--- a/frontend/src/env.js
+++ b/frontend/src/env.js
@@ -25,6 +25,7 @@ export const env = createEnv({
    */
   client: {
     NEXT_PUBLIC_BACKEND_BASE_URL: z.string().optional(),
+    NEXT_PUBLIC_LANGGRAPH_BASE_URL: z.string().optional(),
   },
 
   /**
@@ -39,6 +40,7 @@ export const env = createEnv({
     NODE_ENV: process.env.NODE_ENV,
 
     NEXT_PUBLIC_BACKEND_BASE_URL: process.env.NEXT_PUBLIC_BACKEND_BASE_URL,
+    NEXT_PUBLIC_LANGGRAPH_BASE_URL: process.env.NEXT_PUBLIC_LANGGRAPH_BASE_URL,
   },
   /**
    * Run `build` or `dev` with `SKIP_ENV_VALIDATION` to skip env validation. This is especially