What Is HTTP PATCH? A Complete Guide to Partial Updates
HTTP PATCH applies partial changes to a resource. Learn PATCH versus PUT, JSON Patch, atomicity, ETags, errors, retries, and working examples.
Engineering
Puppeteer, Playwright, Selenium and headless Chrome, and what they take to run well.
Scaling Web Scrapers
Scale crawls safely by partitioning work, controlling per-site rates, finding bottlenecks, and measuring useful records instead of raw requests.
What Is a Reverse Proxy?
A reverse proxy receives client requests for your servers, then routes, caches, secures, and returns responses from the right backend.
Dynamic Memory Allocation for Web Scraping Jobs
Control memory in long scraping jobs by measuring queues, bounding responses, tuning concurrency, and handling browser state without losing useful data.
Why Isn’t HTTPS Used for All Web Traffic?
HTTPS protects most web connections, but capacity, legacy systems, policy, and local-device designs still leave gaps.
Who Owns Puppeteer? Google’s Role, Governance, and Licensing Explained
Google’s Chrome Browser Automation team maintains Puppeteer. Learn what that means for ownership, copyright, licensing, and the npm package.
Improve This APNG Webpage Recorder to Capture Smooth 30+ FPS Video
A 10 ms sleep does not make Playwright screenshots run at 100 FPS. Measure capture latency, find where frames are lost, and choose a recording method that fits your animation.
How to Scale Puppeteer and Playwright
Scale browser automation by balancing concurrency with isolation. Configure Playwright workers and shards, and build safer Puppeteer and Playwright services.
Detecting Failed Screenshot Requests
Learn to distinguish network failures, HTTP errors, timeouts, and visual mismatches when a screenshot request fails.
VPN Detection: How to Detect Whether an IP Uses a VPN
Learn how sites detect VPN IPs, why signals are imperfect, and how to combine IP intelligence with browser and network checks.
Reproducible Playwright Screenshot Tests Across Environments for Visual Regression
Make Playwright visual regression tests reproducible across local machines and CI by pinning the rendering environment, stabilizing pages, and reviewing baselines.
What Are Scrapy Middlewares and How Do You Use Them?
Learn how Scrapy downloader and spider middleware work, how ordering and hooks interact, and how to build, test, and troubleshoot custom middleware.
How to Build a Distributed Crawling Engine in Node.js
Build a durable, distributed Node.js crawler with BullMQ, Redis, robots.txt compliance, URL deduplication, retries, and reliable result storage.
How to Fix Puppeteer Context Loss Before Retrieving List Items
Fix Puppeteer’s “execution context was destroyed” error by synchronizing navigation, waiting for real list readiness, and extracting from the current page.
How to Get Full Page HTML Including Shadow Roots with Puppeteer
Learn how to extract complete page HTML with Puppeteer, recursively serialize open Shadow DOM, handle closed roots, and avoid common DOM snapshot traps.
X448: Security and TLS Elliptic Curve Support
Learn what X448 does, how TLS 1.3 uses it, how its security compares with X25519, and what to check for compatibility.
secp224r1: Security and TLS Elliptic Curve Support
Learn what secp224r1 means, where TLS 1.2 supports it, why TLS 1.3 omits it, and how to verify your actual cryptographic stack.
GPU-Accelerated Website Screenshots
Learn when headless Chrome can use a GPU, how to capture with Chrome and Playwright, and how to make screenshots repeatable.