A CaptchaFox token is bound to the browser that minted it, so the solve is only half the job. Here is the C# call, the widget source that decides the token format, and how to submit under the right user agent.

Crawl4AI has no CAPTCHA solver of its own, and since 0.8.5 its js_code runs after wait_for, which breaks the obvious way to submit a token. Here is the session flow that works, plus a hook for deep crawls.

Three limits end a solve on Cloud Run: gunicorn’s 30 second worker timeout, a 300 second request timeout that matches the SDK’s own, and a loopback address that reaches nothing. Here is the deploy that clears all three.

Friendly Captcha ships two protocols under one name and one sitekey namespace, and solving the wrong one gets you a token the site quietly rejects. Here is how to tell them apart in C#, the call, and the field each token goes in.

Prefect Cloud never executes your flow, so a worker on your own machine can reach the solver on 127.0.0.1. The two things to get right are retries and switching caching off, because a token is single use.

Patchright runs evaluate in an isolated context, so a token write reaches the DOM but the page’s own callback is missing. One extra argument puts the script back in the main world.

ALTCHA is proof of work, so the browser never has to answer it. Capture the challenge Playwright already saw, solve it locally in milliseconds, and write the token into the field the form sends.

Two things end a serverless solve: API Gateway stops waiting after 29 seconds, and 127.0.0.1 inside the Lambda sandbox reaches nothing at all. Here is where the solve belongs instead, and how to give one AWS address a route to your own machine.

Selenium has no one-line wait for a response, and this job does not need one. Read the challenge endpoint off the widget attribute, solve the proof of work locally in milliseconds, then write the token into the field the form posts.

A CAPTCHA inside a mobile app stops an Appium run dead. Screenshot the element, solve it locally, type the answer back, and raise the one timeout that would otherwise end your session while the solver is still working.