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Nginx Redirect Rules: 301s, HTTPS and www Examples
Copy-paste nginx redirect rules: return vs rewrite, 301 redirects, HTTP to HTTPS, www to non-www, plus the loop and location pitfalls to avoid.
TLS Versions Explained: 1.0, 1.1, 1.2 and 1.3 Compared
Which TLS versions are deprecated, which are safe, and what to run in 2026. A plain comparison of TLS 1.0, 1.1, 1.2 and 1.3, with checks you can run today.
HTTP Headers: Debug HTTP/2 and HTTP/3 Without Installing Tools
Learn how HTTP headers shape requests, caching, security, and APIs. Compare HTTP/2 and HTTP/3, inspect examples, and debug without installing tools.
Email Regex Validation: One Pattern, Three Languages, and Its Limits
Copy a practical email regex for JavaScript, Python, and C#, see which edge cases it handles, and learn why a match still cannot confirm delivery.
ISO 8601 Format: JavaScript’s `toISOString()` Can Surprise You
See how ISO 8601 timestamps work in APIs, compare `Z` with `+00:00`, and convert JavaScript dates with `toISOString()` without timezone confusion.
Base64 Data URLs: 4 Steps From File to Working HTML, CSS, or SVG
Build Base64 data URLs with exact syntax, HTML, CSS, and SVG examples, then troubleshoot errors and validate them with Pingfloat’s free encoder and decoder.
JavaScript Timezone Conversion: IANA Zones Keep DST Correct
Format dates with IANA zones using Intl.DateTimeFormat, then use Temporal or timezone aware libraries for DST safe arithmetic in browsers and Node.js.
DNS Troubleshooting for IT and Dev Teams: 5 Commands to Find Faults
Use dig and nslookup to trace DNS failures from device to resolver, test DNSSEC, EDNS, and transport issues, then verify recovery with diagnostic tools.
Ping vs Traceroute for IT Pros: When ICMP Misleads
Compare ping and traceroute on Windows, Linux, and macOS; interpret asymmetric routes and ICMP limits, then use Pingfloat for live traces and uptime checks.