HTTP headers play a crucial role in web app network communication, providing specifications for activities such as data handling and session verification. However, insecure HTTP headers can be exploited by attackers to breach apps in various ways, including cross-site scripting (XSS), web-cache poisoning, clickjacking, and man-in-the-middle (MITM) attacks. To combat these threats, configuring security-focused HTTP header fields is essential, which can be challenging due to the variety of data they contain. Synthetic testing enables developers to check their security header configuration and spot potential weak points in their app, better securing existing headers and configuring new ones as necessary. By using synthetic testing tools like Datadog Synthetic Monitoring, developers can ensure that their security headers are implemented correctly and aren't exposing key information or entry points for attackers, ultimately protecting their apps against various types of attacks.