HTTP headers are crucial for web app network communication, providing specifications for activities like data handling and session verification. Attackers often target HTTP headers to learn more about their targets, steal sensitive data, or manipulate user sessions. Configuring security-focused HTTP header fields can help define how an app transmits data, loads resources, and executes scripts, making it harder for attackers to compromise the system. Synthetic testing helps address these challenges by enabling users to check their security header configuration and see how it handles a wide variety of use cases, spotting potential weak points in the app and better securing existing headers. To prevent attacks, apps should configure specific headers such as X-Content-Type-Options, HTTP Strict Transport Security (HSTS), and Content-Security-Policy, which can be customized using NGINX or Apache configurations. Synthetic testing provides out-of-the-box templates to quickly check security header configuration for apps, including the Security Headers template that checks for key headers like X-Content-Type-Options, X-Frame-Options, Content-Security-Policy, and HSTS. The Information Disclosure template also provides recommendations for protecting app data from misconfigurations that could leave it vulnerable to security disclosure attacks.