diff --git a/backend-integration/api-proxy.js b/backend-integration/api-proxy.js
index da394046..b6d77f47 100644
--- a/backend-integration/api-proxy.js
+++ b/backend-integration/api-proxy.js
@@ -451,8 +451,8 @@ const userModelCache = new Map();
 const USER_MODEL_CACHE_TTL_MS = 60 * 60 * 1000; // 1 小时
 
 function getUserCacheKey(apiBase, apiKey) {
-  const hash = crypto.createHash('sha256').update(apiKey).digest('hex').slice(0, 16);
-  return apiBase + '::' + hash;
+  const hash = crypto.createHash('sha256').update(apiBase + '\0' + apiKey).digest('hex').slice(0, 32);
+  return 'user-models::' + hash;
 }
 
 function getCachedUserModels(apiBase, apiKey) {
@@ -636,9 +636,12 @@ async function handleDetectModels(req, res) {
     return jsonResponse(res, 400, { error: true, code: 'INVALID_API_KEY', message: 'API Key 格式无效（含非法字符）' });
   }
 
-  // 校验 api_base 格式
+  // 校验 api_base 格式和协议（仅允许 http/https，防止 SSRF）
   try {
-    new URL(api_base);
+    const parsedUrl = new URL(api_base);
+    if (parsedUrl.protocol !== 'https:' && parsedUrl.protocol !== 'http:') {
+      return jsonResponse(res, 400, { error: true, code: 'INVALID_API_BASE', message: 'API Base URL 仅支持 http/https 协议' });
+    }
   } catch (_e) {
     return jsonResponse(res, 400, { error: true, code: 'INVALID_API_BASE', message: 'API Base URL 格式无效，请输入完整 URL（如 https://api.openai.com）' });
   }
diff --git a/persona-studio/frontend/index.html b/persona-studio/frontend/index.html
index f3652962..0fe20170 100644
--- a/persona-studio/frontend/index.html
+++ b/persona-studio/frontend/index.html
@@ -202,14 +202,12 @@
         btn.textContent = '🔍 重新检测';
       } catch (fetchErr) {
         var errMsg = '检测失败';
-        if (fetchErr instanceof TypeError && fetchErr.message.includes('fetch')) {
+        if (fetchErr instanceof TypeError) {
           errMsg = '服务器代理未部署或不可达，请联系管理员';
         } else if (fetchErr.name === 'AbortError') {
           errMsg = '请求超时，请检查网络连接';
-        } else if (fetchErr.message && fetchErr.message.includes('NetworkError')) {
-          errMsg = '跨域被拦截或网络不可达，请确认服务器已部署';
         } else {
-          errMsg = '检测失败: ' + (fetchErr.message || '请检查网络连接');
+          errMsg = '网络错误: ' + (fetchErr.message || '请检查网络连接');
         }
         statusEl.textContent = errMsg;
         statusEl.className = 'detect-status detect-error';
diff --git a/tests/smoke/apikey-detect.test.js b/tests/smoke/apikey-detect.test.js
index ac51ec8b..1de95911 100644
--- a/tests/smoke/apikey-detect.test.js
+++ b/tests/smoke/apikey-detect.test.js
@@ -64,7 +64,8 @@ describe('POST /api/ps/apikey/detect-models', () => {
     });
     expect(res.status).toBe(502);
     expect(res.body.error).toBe(true);
-    expect(['DETECT_FAILED', 'DNS_ERROR', 'NETWORK_ERROR', 'TIMEOUT']).toContain(res.body.code);
+    // DNS resolution failure returns DNS_ERROR; other network issues may return NETWORK_ERROR
+    expect(res.body.code).toMatch(/^(DNS_ERROR|NETWORK_ERROR|TIMEOUT)$/);
   });
 
   test('returns INVALID_API_BASE for malformed URL', async () => {