diff --git a/client/src/lib/aiApi.ts b/client/src/lib/aiApi.ts
index eaa1412..effcba1 100644
--- a/client/src/lib/aiApi.ts
+++ b/client/src/lib/aiApi.ts
@@ -13,13 +13,31 @@ import {
 } from "./luxsinApi";
 import { AI_NETWORK_ERROR_CODE, isLikelyNetworkFetchError } from "./networkError";
 
-// Allow override via Vite env / localStorage; default to same origin in prod.
+const AI_HOST = "v2ai.luxsin.com.cn";
+
+/** Match the page protocol so http://device-ip does not call https://v2ai (and vice versa). */
+function currentPageProtocol(): "http:" | "https:" {
+  if (typeof window !== "undefined" && window.location.protocol === "http:") return "http:";
+  return "https:";
+}
+
+function withPageProtocol(url: string): string {
+  const trimmed = url.replace(/\/$/, "");
+  const protocol = currentPageProtocol();
+  if (/^https?:\/\//i.test(trimmed)) {
+    return trimmed.replace(/^https?:\/\//i, `${protocol}//`);
+  }
+  if (trimmed.startsWith("//")) return `${protocol}${trimmed}`;
+  return trimmed;
+}
+
+// Allow override via Vite env / localStorage; protocol follows the current page.
 export function getAIBaseUrl(): string {
   const fromLs = typeof window !== "undefined" ? window.localStorage.getItem("luxsin_ai_url") : null;
-  if (fromLs) return fromLs.replace(/\/$/, "");
+  if (fromLs) return withPageProtocol(fromLs);
   const fromEnv = (import.meta as any).env?.VITE_AI_API_URL as string | undefined;
-  if (fromEnv) return fromEnv.replace(/\/$/, "");
-  return "https://v2ai.luxsin.com.cn";
+  if (fromEnv) return withPageProtocol(fromEnv);
+  return `${currentPageProtocol()}//${AI_HOST}`;
 }
 
 // ============================================================