checking-http-security-headers
Audit a target's HTTP security headers — CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, and the Cross-Origin trio (COOP, COEP, CORP). Use when: SOC2 / PCI auditor flagged "missing security headers" or a Mozilla Observatory grade is below B, OR you need HSTS preload eligibility for chrome://net-internals. HSTS max-age below 31536000s (preload requirement), CSP with 'unsafe-inline' or 'unsafe-eval', X-Frame-Options absent AND CSP frame-ancestors absent (clickjacking), Cache-Control allowing public cache on authenticated endpoint. Trigger with: "audit s
npx skills add jeremylongshore/claude-code-plugins-plus-skills --skill checking-http-security-headers --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Checking HTTP Security Headers ## Overview HTTP response headers are the cheapest defense-in-depth layer most web apps ship. Each header closes one specific attack class — HSTS forces HTTPS, CSP blocks script injection, X-Frame-Options blocks clickjacking, etc. Missing headers don't break the app; they just leave the attack class open. This skill probes for the presence + value correctness of th
What does the checking-http-security-headers skill do?
Audit a target's HTTP security headers — CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, and the Cross-Origin trio (COOP, COEP, CORP). Use when: SOC2 / PCI auditor flagged "missing security headers" or a Mozilla Observatory grade is below B, OR you need HSTS preload eligibility for chrome://net-internals. HSTS max-age below 31536000s (preload requirement), CSP with 'unsafe-inline' or 'unsafe-eval', X-Frame-Options absent AND CSP frame-ancestors absent (clickjacking), Cache-Control allowing public cache on authenticated endpoint. Trigger with: "audit s
How do I install it?
Run `npx skills add jeremylongshore/claude-code-plugins-plus-skills --skill checking-http-security-headers --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From jeremylongshore/claude-code-plugins-plus-skills, a repository with 2,596 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.