Articles & Guides
Useful resources for web developers and system administrators
Networking
TCP Tuning: Keepalive, Window Size and Nagle's Algorithm
Master TCP connection tuning parameters including keepalive settings, window size optimization, and Nagle's algorithm for improved network performance.
SEO
Sitemap XML: Structure, Limits, Generation and Validation
Sitemap.xml explained: urlset and url structure, the 50,000 URL and 50 MB limits, sitemap index, hreflang, generation, the robots.txt line and validation.
Security
Two-Factor Authentication Guide: TOTP, SMS, and Hardware Keys
A comprehensive guide to two-factor authentication types including TOTP, SMS verification, and hardware security keys with implementation best practices.
Performance
Content Delivery Optimization: CDN and Edge Computing
Learn advanced CDN optimization strategies, edge computing patterns, and cache hierarchy design to deliver content faster to users worldwide.
Monitoring
Designing Effective Health Check Endpoints for Web Services
Learn how to build health check endpoints that accurately report service status. Cover liveness vs readiness, dependency checks, and response formats.
Security
Rate Limiting Strategies for Web APIs and Applications
Explore rate limiting algorithms — token bucket, sliding window, fixed window — and learn how to implement effective API rate limiting.
SEO
Website Accessibility: Why Overlay Widgets Do Not Work
Why an accessibility overlay does not make a site accessible, which practical minimum removes most barriers — semantics, contrast, keyboard — and how to test all of it.
HTTP
X-Forwarded-For Header: Understanding Client IP Behind Proxies
Learn how the X-Forwarded-For header works, why it matters for logging and security, trust chain configuration, and common pitfalls.
Performance
CDN Cache Invalidation: Strategies for Fresh Content
Master CDN cache invalidation techniques. Learn purge strategies, cache-busting, TTL tuning, and how to balance freshness with performance.
SSL/TLS
Wildcard SSL Certificate: Coverage, Cost and Free Setup
What a wildcard SSL certificate covers and what it misses, free vs paid options, Let's Encrypt DNS-01 commands, CAA issuewild and the 2026–2029 validity cuts.