What Case Should HTTP Headers Use: Lowercase or Pascal Case?
Use lowercase for HTTP header names: names are case-insensitive, and HTTP/2 and HTTP/3 require lowercase on the wire. Header values follow their own rules.
Engineering
Puppeteer, Playwright, Selenium and headless Chrome, and what they take to run well.
Using Paged.js with Next.js
Build paginated print layouts in Next.js with Paged.js, including client-only loading, CSS, PDF workflows, troubleshooting, and production guidance.
Why Web Crawling Fails at Scale and How to Fix It
At scale, crawlers can overwhelm finite host capacity or waste requests on low-value URLs. Diagnose the bottleneck, protect sites, and improve useful coverage.
Media Codec and MIME Type Fingerprint Test: Detect Supported Formats
Learn how to detect browser media support with canPlayType() and MediaCapabilities, interpret results, and understand codec fingerprinting privacy limits.
How to Improve Node.js Performance
A measurement-first guide to finding Node.js bottlenecks, profiling CPU and memory, benchmarking safely, and validating each optimization.
Improving URL-to-Image Screenshot Performance
Make URL screenshots faster and more reliable by measuring each pipeline stage, choosing the right wait condition, and capturing only what you need.
Convert HTML to Image in Rust
Render arbitrary HTML, CSS, and JavaScript to PNG or JPEG in Rust with headless Chromium, reliable waits, full-page capture, and production fixes.
Signed Certificate Timestamps and Certificate Transparency
Learn what Signed Certificate Timestamps mean, how Certificate Transparency works, and how to monitor certificates issued for your domain.
How to Build a Search Engine for Any Website
Build a reliable site search pipeline: crawl, extract, index, rank, serve results, and keep robots.txt, freshness, and access rules correct.
How to Track Prices and Product Catalogs at Scale
Build a reliable pipeline for tracking prices, availability, offers, and catalog changes across thousands of products and sources.
Capturing Live User-Contributed Web Content with Screenshots
Learn when to use Playwright screenshots or getDisplayMedia for user-contributed content, with complete code, privacy controls, troubleshooting, and a hosted option.
What Is HTTP 503 in Web Scraping? Meaning, Retries, and Fixes
HTTP 503 means a server is temporarily unavailable. Learn how to diagnose it, honor Retry-After, handle robots.txt, and avoid retry storms.
DevOps in 2026: Latest Trends and Vital Statistics
The 2026 DevOps picture: cloud-native growth, platform engineering, Kubernetes maturity, AI overlap, and the organizational practices behind reliable delivery.
HTTP/2 and HTTP/3 Fingerprinting: Protocol-Level Bot Detection
Learn what HTTP/2 and HTTP/3 reveal about automated clients, how JA3 and JA4 fit in, and how to use protocol signals safely.
Social Media Analytics APIs for Developers
Choose a social analytics API by whose data you need, account eligibility, permissions, and reporting workflow. Includes platform routes, code, and an integration checklist.
ASN vs. IP Address vs. CIDR Block: The Difference
Understand what an IP address, CIDR block, and ASN identify, how they relate, and when each matters for routing, security, and network operations.
Alert State Machines for Website Monitoring
Design monitoring alerts that distinguish brief failures, persistent incidents, recovery, missing data, and muted notifications—with practical state logic and code.
Adding Foreground Tab Tracking to the Chrome DevTools Protocol (CDP)
Learn how CDP exposes tab order, foreground state, pinning and groups, and how to build a reliable tab-to-page inventory.