Articles & Guides
Useful resources for web developers and system administrators
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.
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
Server Response Headers: What They Reveal About a Site
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.
Performance
What Is a CDN: How It Works, Why You Need It and How to Check
What a CDN is and how it works: origin, edge nodes, cache and TTL. What a CDN speeds up and what it does not, where nodes sit, how to check a site and what drives cost.
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.
SSL/TLS
What Is a TLS Certificate? SSL vs TLS, Setup, Checks, Errors
What a TLS certificate contains, why SSL and TLS certificates are the same thing, how to get one free, where to find it on your server and how to fix errors.
HTTP
HTTP Status Codes: Complete Reference with Examples
A complete reference of all HTTP status codes from 100 to 599 with descriptions and examples. Learn what each code means and how to handle it.