Secure HTTP Headers is a free WordPress plugin designed to strengthen web application security by implementing HTTP header fields. It automates the process of securing headers, which are essential in defining the operating parameters of HTTP transactions. By using this plugin, users can protect their applications against common vulnerabilities listed in the OWASP top 10, improve SEO rankings, and ensure compliance with privacy regulations. It also safeguards sensitive user information by applying directives such as 'secure', 'httponly', and 'samesite' to cookies automatically.

The plugin comes equipped with various functionalities, including HTTP Strict Transport Security, X-Frame-Options, and Referrer-Policy, among others. Users can customize header directives according to their needs, and the plugin ensures that any changes made will revert to the original state upon deactivation. Additionally, an enhanced version called Magnisec is available for a yearly fee, which offers advanced features like a Content Security Policy engine to further mitigate risks associated with cross-site scripting attacks.