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A small round teal-and-cream robot reaches up to pull a grey roller shutter down over a green service hatch under a 499 sign, already walking away, while a parcel tied with string still sits on a roller conveyor inside, on a sunny cobbled square with olive trees, crates and a street lamp.

Error Resolution

HTTP 499 Client Closed Request: What It Means and How to Fix It

HTTP 499 is nginx's code for a client that hung up before the response. We reproduce it with nginx and a slow upstream and show which timeout to fix.

November 12, 2026 · 25 min read

Normal user things

Scraping Techniques

curl_cffi: What Impersonation Actually Changes on the Wire

Nov 10, 2026 · 7 min read

A mole in a yellow hard hat turns a brass key in a big brass padlock hanging from a red-and-white striped barrier across a cobbled honey-stone lane, beside a red-brick gatehouse with a 407 sign, wisteria and a lantern, with an open wooden toolbox of spanners and a hammer at its feet.

Error Resolution

Error 407 Proxy Authentication Required: Causes and Fixes

Oct 31, 2026 · 21 min read

sticky vs rotation

Proxy Fundamentals

Rotating Proxies: How Residential IP Rotation Works

Oct 26, 2026 · 10 min read

A small round robot holds up a brass stopwatch, timing a row of wooden carts, each carrying an orange ball, as they roll side by side on parallel rails out of the open doors of a whitewashed datacenter full of server racks, in a sunny stone-flagged yard.

Proxy Fundamentals

Benchmarking Datacenter Proxies Under Concurrency

Oct 24, 2026 · 25 min read

proxy setting

Setup Guides

How to Find Your Proxy Server Address on Any Device

Oct 23, 2026 · 9 min read

Bad ip handling

Security Concepts

IP Abuse: How to Check, Report and Fix a Flagged IP

Oct 19, 2026 · 10 min read

A mole in a yellow hard hat peers through a large magnifying glass at a big smartphone on a wooden stand, its screen showing a map with a red location pin, beside a red-and-white cell tower whose base carries a cream plate lettered ASN, in a sunny field corner by a dry-stone wall.

Proxy Fundamentals

How to Verify a Mobile Proxy's Carrier, ASN, and Location

Oct 17, 2026 · 21 min read

Proxy connection issues

Error Resolution

Cannot Establish Proxy Connection? How to Fix It

Oct 16, 2026 · 10 min read

Choosing location

Scraping Techniques

Multi-Region Crawling: Geo-Targeted Collection and Where the Data Lives

Oct 14, 2026 · 7 min read

A small round robot in a sunny red-brick yard pushes a glass canister of crumpled pages back into a brass pneumatic-tube terminal under a large API plate, beside a RETRY signboard, while a brass pipeline feeds a conveyor belt carrying finished pages into a wire basket.

Scraping Techniques

Scraper API Retry Handling for Production Pipelines

Oct 13, 2026 · 20 min read

A shopkeeper at a market stall on a sunny harbour quay peers through a magnifying glass at three upright local price tags marked $, £ and ¥ under US, UK and Japanese flags, stamping a green tick on the £ tag, beside a globe and a shopping cart full of parcels.

Use Cases

Cross-Country Ecommerce Price Monitoring: How to Get and Prove Local Prices

Oct 7, 2026 · 20 min read

Queue for spider

Scraping Techniques

The Crawl Frontier: Redis, SQS and Kafka for URL Queues

Oct 7, 2026 · 8 min read

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