diff --git a/lib/renderer/security-warnings.ts b/lib/renderer/security-warnings.ts
index 314d4d42c972..97fbe6234521 100644
--- a/lib/renderer/security-warnings.ts
+++ b/lib/renderer/security-warnings.ts
@@ -103,10 +103,14 @@ const warnAboutInsecureResources = function () {
     return;
   }
 
+  const isLocal = (url: URL): boolean =>
+    ['localhost', '127.0.0.1', '[::1]', ''].includes(url.hostname);
+  const isInsecure = (url: URL): boolean =>
+    ['http:', 'ftp:'].includes(url.protocol) && !isLocal(url);
+
   const resources = window.performance
     .getEntriesByType('resource')
-    .filter(({ name }) => /^(http|ftp):/gi.test(name || ''))
-    .filter(({ name }) => new URL(name).hostname !== 'localhost')
+    .filter(({ name }) => isInsecure(new URL(name)))
     .map(({ name }) => `- ${name}`)
     .join('\n');
 
diff --git a/spec-main/index.js b/spec-main/index.js
index cc605acf3cec..40c783093027 100644
--- a/spec-main/index.js
+++ b/spec-main/index.js
@@ -30,6 +30,7 @@ app.on('window-all-closed', () => null);
 
 // Use fake device for Media Stream to replace actual camera and microphone.
 app.commandLine.appendSwitch('use-fake-device-for-media-stream');
+app.commandLine.appendSwitch('host-rules', 'MAP localhost2 127.0.0.1');
 
 global.standardScheme = 'app';
 global.zoomScheme = 'zoom';
diff --git a/spec-main/security-warnings-spec.ts b/spec-main/security-warnings-spec.ts
index cf25d8530dc8..474e9246d875 100644
--- a/spec-main/security-warnings-spec.ts
+++ b/spec-main/security-warnings-spec.ts
@@ -59,7 +59,7 @@ describe('security warnings', () => {
         });
       });
     }).listen(0, '127.0.0.1', () => {
-      serverUrl = `http://127.0.0.1:${(server.address() as AddressInfo).port}`;
+      serverUrl = `http://localhost2:${(server.address() as AddressInfo).port}`;
       done();
     });
   });