Improving Security Rating of a Hugo-Based Blog from "F" to "A+" Using HTTP Security Headers

The article details a process to improve the security rating of a Hugo-based blog from an "F" to an "A+" on Mozilla’s HTTP Observatory by hardening HTTP security headers. The author, identified as "Zwindler," implemented specific header configurations such as Content-Security-Policy, Strict-Transport-Security, X-Content-Type-Options, and Referrer-Policy to mitigate risks like cross-site scripting (XSS) and data leaks. The changes were applied to a static website hosted on a platform compatible with Hugo, with no specific vulnerabilities (e.g., CVE IDs) or attack incidents mentioned. The improvements were validated using the HTTP Observatory tool, which assesses header security compliance. The article was published on February 20, 2026.