diff --git a/src/components/settings/DebugSection.tsx b/src/components/settings/DebugSection.tsx
index 2e0ac203..c923cbca 100644
--- a/src/components/settings/DebugSection.tsx
+++ b/src/components/settings/DebugSection.tsx
@@ -139,14 +139,20 @@ export function DebugSection() {
     }
   };
 
-  const webServerAddress = (() => {
-    if (!webServerPort) return null;
-    if (allowLanAccess) {
-      const host = isTauri() ? lanIp || 'localhost' : window.location.hostname;
-      return `http://${host}:${webServerPort}`;
-    }
-    return `http://localhost:${webServerPort}`;
-  })();
+const webServerAddress = (() => {
+
+  if (window.location.host && !isTauri()) {
+    return window.location.origin;
+  }
+  
+  // Tauri 桌面端直连后端
+  if (!webServerPort) return null;
+  
+  const host = allowLanAccess 
+    ? (lanIp || 'localhost') 
+    : 'localhost';
+  return `http://${host}:${webServerPort}`;
+})();
 
   const handleOpenWebServer = useCallback(async () => {
     if (!webServerAddress) return;
diff --git a/src/services/wsService.ts b/src/services/wsService.ts
index fd4168e1..5588cf14 100644
--- a/src/services/wsService.ts
+++ b/src/services/wsService.ts
@@ -91,12 +91,16 @@ export function setServerPort(port: number): void {
 
 function getWsUrl(): string {
   const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
-  if (serverPort) {
-    const hostname = window.location.hostname;
-    return `${protocol}//${hostname}:${serverPort}/api/ws`;
+
+  // 正常情况：通过 Nginx 反向代理
+  if (window.location.host) {
+    return `${protocol}//${window.location.host}/api/ws`;
   }
-  const host = window.location.host;
-  return `${protocol}//${host}/api/ws`;
+
+  // Fallback：直连后端
+  const hostname = window.location.hostname || '127.0.0.1';
+  const port = serverPort || 12701;
+  return `${protocol}//${hostname}:${port}/api/ws`;
 }
 
 // ============================================================================
diff --git a/src/utils/backendApi.ts b/src/utils/backendApi.ts
index 80c58e35..077d6a83 100644
--- a/src/utils/backendApi.ts
+++ b/src/utils/backendApi.ts
@@ -16,11 +16,16 @@ export function setBackendPort(port: number): void {
 }
 
 export function getApiBase(): string {
-  if (backendPort) {
-    const protocol = window.location.protocol === 'https:' ? 'https:' : 'http:';
-    return `${protocol}//${window.location.hostname}:${backendPort}/api`;
+  // 正常情况：通过 Nginx 反向代理，用相对路径
+  if (window.location.host) {
+    return '/api';
   }
-  return '/api';
+  
+  // Fallback：直连后端
+  const protocol = window.location.protocol === 'https:' ? 'https:' : 'http:';
+  const hostname = window.location.hostname || '127.0.0.1';
+  const port = backendPort || 12701;
+  return `${protocol}//${hostname}:${port}/api`;
 }
 
 /** 安全解析 JSON 响应，204 / 空 body 时返回 undefined */