How to Generate Open Graph Images in Deno
Generate dynamic Open Graph images in Deno with Satori and Resvg, including fonts, caching, deployment, troubleshooting, and complete code.
Engineering
Puppeteer, Playwright, Selenium and headless Chrome, and what they take to run well.
Common Network Protocols Explained
Learn what IP, TCP, UDP, HTTP, HTTPS, DNS, SMTP, IMAP, FTP and SSH do, how they work together, and when to use each.
How to Protect Generated PDFs in Go
Generate a PDF in Go, encrypt it with AES-256 using pdfcpu, set permissions safely, and stream the protected file without exposing plaintext.
WOFF Font Support in Website Screenshots
Learn why screenshots use fallback fonts, how WOFF and WOFF2 differ, and how to wait for web fonts before capturing pages.
SEC Filings Scraper: Clean JSON Output
Build a reliable SEC filings scraper with clean, traceable JSON using public SEC APIs, filing archives, and practical parsing patterns.
IPv4 vs. IPv6: Which Is Faster?
Neither IPv4 nor IPv6 is always faster. Compare both paths to the same destination and weigh latency, reliability, setup time, throughput, and jitter.
Retrying Failed Requests in Go: Safe Backoff, Deadlines, and Idempotency
Build bounded, cancelable retries in Go without duplicating writes, losing request bodies, or amplifying an outage.
TLS Cipher Suites in Web Scraping
Learn how TLS cipher suites are negotiated, how they affect scraper compatibility and fingerprints, and how to diagnose HTTPS failures safely.
How to Choose and Maintain PHP HTTP Client Libraries
Choose between Guzzle, Symfony HttpClient and PSR-18 by matching the client to your app, workload and integration needs. Then keep its dependencies secure and testable.
The Future of Web Scraping in 2026
Web scraping is shifting toward managed pipelines, AI-assisted extraction, and purpose-based access rules. Here’s how to plan for reliability, cost, and governance.
Extract Open Graph Metadata While Rendering Screenshots
Use Playwright to render pages, extract ordered Open Graph metadata, and save viewport, full-page, or element screenshots reliably.
Transformers: Definition and How They Work
Learn what an electrical transformer does, how magnetic induction transfers AC energy, and why grids step voltage up and down.
Prompt Engineering: Definition and How It Works
Learn prompt engineering with practical examples, an iteration workflow, evaluation methods, model-specific guidance, and production checklists.
Data Processing and Validation for Web Scraping
Build a reliable scraping pipeline that normalizes, validates, deduplicates, stores, and monitors records without losing source context.
How Custom Fonts Work in Image Rendering
Learn how fonts load, shape, and rasterize in screenshots and canvas—and how to make custom typography deterministic.
Using Cache Keys to Control Website Screenshot Caching
Build screenshot cache keys from every input that can change the rendered output. Learn how to version, refresh, and troubleshoot screenshot caches across providers.
Time to First Byte (TTFB) Checker: Test Online
Measure TTFB in your browser, terminal, Python, or Node.js, understand every timing phase, and interpret results without mistaking TTFB for full page speed.
Web Scraping, PDF Generation, Infrastructure, and Security Improvements
Crawl4AI’s recent releases show why PDF downloads need their own security controls—and how to operate a self-hosted crawler more safely.