Articles & Guides
Useful resources for web developers and system administrators
SSL/TLS
SSL/TLS Certificates: How HTTPS Works
How SSL/TLS works, certificate types, the TLS handshake process, Let's Encrypt setup, common errors, and how to fix them.
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.
Security
Security Headers: CSP, HSTS, X-Frame-Options and More
How to protect your website with HTTP security headers. Configuring Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, and other headers.
HTTP
HTTP headers explained: request, response, caching and proxy headers
HTTP request and response headers in depth: every Cache-Control directive, ETag and 304, Vary, Content-Type, X-Forwarded-For, nginx config and curl checks.