Chrome://flags/#allow-insecure-localhost //top\\ Jun 2026

: Ensure you are actually using https://localhost and not a custom local domain (like mysite.test ). This flag usually does not apply to custom hostnames.

Allow Insecure Localhost

To test this feature, follow these steps: chrome://flags/#allow-insecure-localhost

In the address bar, type or paste: chrome://flags/#allow-insecure-localhost and hit .

: Modern web APIs often require a "Secure Context." Using this flag lets you test HTTPS-only features on your machine without buying or managing complex local certificates. : Ensure you are actually using https://localhost and

By leveraging chrome://flags/#allow-insecure-localhost , you can remove a significant hurdle in your daily development cycle, allowing you to focus on building features rather than fighting browser security warnings.

void SecurityManager::CheckConnectionSecurity() // ... if (IsLocalhost(host) && !IsInsecureLocalhostAllowed()) // Block insecure connection else // Allow connection : Modern web APIs often require a "Secure Context

Enabling the flag tells Chrome to relax its strict security requirements specifically for the localhost loopback interface.