security-headers-configuration
Configures HTTP security headers to protect against XSS, clickjacking, and MIME sniffing attacks. Use when hardening web applications, passing security audits, or implementing Content Security Policy.
How do I install this agent skill?
npx skills add https://github.com/secondsky/claude-skills --skill security-headers-configurationIs this agent skill safe to install?
- Gen Agent Trust Hubpass
The skill provides comprehensive guidance and code examples for implementing HTTP security headers across various platforms including Express.js, Nginx, Flask, and Apache. It follows established security best practices, such as recommending the use of nonces for Content Security Policy (CSP) and highlighting reputable libraries like Helmet and Flask-Talisman. No malicious patterns, obfuscation, or unauthorized data access were detected.
- Socketpass
No alerts
- Snykpass
Risk: LOW · No issues
- Runlayerwarn
2/2 files flagged
- ZeroLeakspass
Score: 93/100 · 2 sections analyzed
What does this agent skill do?
Security Headers Configuration
Implement HTTP security headers to defend against common browser-based attacks.
Essential Headers
| Header | Purpose | Value |
|---|---|---|
| HSTS | Force HTTPS | max-age=31536000; includeSubDomains |
| CSP | Restrict resources | default-src 'self' |
| X-Frame-Options | Prevent clickjacking | DENY |
| X-Content-Type-Options | Prevent MIME sniffing | nosniff |
Express Implementation
const helmet = require('helmet');
app.use(helmet());
// Custom CSP
app.use(helmet.contentSecurityPolicy({
directives: {
defaultSrc: ["'self'"],
scriptSrc: ["'self'", "'unsafe-inline'"],
styleSrc: ["'self'", "'unsafe-inline'"],
imgSrc: ["'self'", "data:", "https:"],
connectSrc: ["'self'", "https://api.example.com"],
fontSrc: ["'self'", "https://fonts.gstatic.com"],
frameAncestors: ["'none'"]
}
}));
Nginx Configuration
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
add_header X-Frame-Options "DENY" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-XSS-Protection "1; mode=block" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;
add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;
add_header Content-Security-Policy "default-src 'self'; script-src 'self'" always;
Verification Tools
Security Headers Checklist
- HSTS enabled with long max-age
- CSP configured and tested
- X-Frame-Options set to DENY
- X-Content-Type-Options set to nosniff
- Referrer-Policy configured
- Permissions-Policy disables unused features
Additional Implementations
See references/python-apache.md for:
- Python Flask security headers middleware
- Flask-Talisman library configuration
- Apache .htaccess configuration
- Header testing script
Common Mistakes
- Setting CSP to report-only permanently
- Using overly permissive policies
- Forgetting to test after changes
- Not including all subdomains in HSTS
How can the creator link this skill?
Add the canonical catalog link to the repository README so users can inspect current installs and available audits. The publishing guide covers the complete discovery path.
<a href="https://skillzs.dev/skills/secondsky/claude-skills/security-headers-configuration">View security-headers-configuration on skillZs</a>