Articles & Guides
Useful resources for web developers and system administrators
Tools
Batch URL Checking: Automating Website Monitoring
How to check hundreds of URLs at once: batch HTTP status code, header, and redirect verification. Tools and automation.
Networking
IP Geolocation Accuracy: How It Works and Where It Fails
How IP geolocation works, what determines location accuracy, and why VPNs and proxies introduce errors.
DNS
DNS Propagation: Why DNS Changes Don't Take Effect Instantly
Why DNS changes don't apply immediately: TTL, caching, recursive resolvers. How to speed up DNS propagation.
SSL/TLS
SSL Certificate Types: DV, OV, EV — Which One to Choose
Comparison of SSL certificate types: DV, OV, EV, Wildcard, and multi-domain. When to use Let's Encrypt vs. a paid certificate.
HTTP
Analyzing Server Response Headers: What They Reveal About a Website
A detailed guide to HTTP headers: Cache-Control, ETag, Server, CORS, and security headers. How to read and optimize response headers.
SEO
Redirect Chains: How They Affect SEO and Speed
Redirect chains slow down your site and weaken SEO. Learn the difference between 301 and 302, how to find chains, and how to fix them.
Security
API Security: Best Practices for Protection
Best practices for API security: authentication, rate limiting, CORS, HTTPS, data validation, and protection against common threats.
Infrastructure
What Is a CDN and How Does It Speed Up Your Website
Learn what a CDN is, how points of presence work, and why a content delivery network is critical for website speed.
Monitoring
Domain and Website Monitoring: Why and How to Set It Up
A guide to website monitoring: uptime, SSL certificates, DNS changes, ping checks. How to detect problems before they affect your business.
Performance
Website Speed Optimization: A Complete Guide
Learn how to speed up your website: Core Web Vitals, TTFB, LCP, CLS, image optimization, caching, CDN, and resource minification.