diff --git a/frontend/src/core/config/index.ts b/frontend/src/core/config/index.ts
index 80f212e..07f355c 100644
--- a/frontend/src/core/config/index.ts
+++ b/frontend/src/core/config/index.ts
@@ -2,7 +2,10 @@ import { env } from "@/env";
 
 export function getBackendBaseURL() {
   if (env.NEXT_PUBLIC_BACKEND_BASE_URL) {
-    return env.NEXT_PUBLIC_BACKEND_BASE_URL;
+    return new URL(
+      env.NEXT_PUBLIC_BACKEND_BASE_URL,
+      window.location.origin,
+    ).toString();
   } else {
     return "";
   }
@@ -10,7 +13,10 @@ export function getBackendBaseURL() {
 
 export function getLangGraphBaseURL(isMock?: boolean) {
   if (env.NEXT_PUBLIC_LANGGRAPH_BASE_URL) {
-    return env.NEXT_PUBLIC_LANGGRAPH_BASE_URL;
+    return new URL(
+      env.NEXT_PUBLIC_LANGGRAPH_BASE_URL,
+      window.location.origin,
+    ).toString();
   } else if (isMock) {
     if (typeof window !== "undefined") {
       return `${window.location.origin}/mock/api`;