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How to Fix ERROR_CAPTCHA_UNSOLVABLE and Retry Safely
ERROR_CAPTCHA_UNSOLVABLE is a failed attempt, not a broken setup. Why re-polling the same ID never helps, the causes per CAPTCHA type, and a retry loop that works.
Best CAPTCHA Solver in 2026: 10 Services Compared
The best captcha solver in 2026, chosen on published rates and architecture rather than unverifiable accuracy claims, with the full dated price table for all ten services.
How to Handle a Scrapy CAPTCHA with Downloader Middleware
Put CAPTCHA handling in a downloader middleware, not in every spider. Detection, a non-blocking solve, the token resubmit, and the settings that matter.
How to Fix ERROR_KEY_DOES_NOT_EXIST and Wrong User Key
ERROR_KEY_DOES_NOT_EXIST is a key mismatch, not a broken solver. The three causes, the fix in all four SDKs, and how it differs from ERROR_WRONG_USER_KEY.
How to Solve GeeTest v3 in PHP and Post the Result Back
GeeTest returns three values instead of a token, and the challenge expires in about a minute. Here is the PHP flow, and why a job queue can break it.
How to Solve Cloudflare Turnstile in PHP With Composer
A Turnstile widget is a two-argument PHP call. A challenge page needs two extra values and the user agent that came back with the token, or it is rejected.
How to Solve reCAPTCHA v3 in PHP and Set an Action
v3 is the same PHP method as v2 with a version flag. The detail that decides whether it works is the action, which has to match what the page executes.
How to Solve reCAPTCHA v2 in PHP, Including Invisible
All three reCAPTCHA v2 variants are the same PHP method with different array options. Here is each one, plus the exception namespace people miss.
How to Solve GeeTest v3 in Node.js and Post It Back
GeeTest hands back three values, not a token, and the challenge dies in about a minute. Here is the Node.js flow, including why batching breaks it.
How to Solve Cloudflare Turnstile in Node.js and TypeScript
A Turnstile widget is a two-argument call in Node.js. A full challenge page needs two more values and the user agent that came back with the token.