FlareSolverr

FlareSolverr is a lightweight HTTP API service that helps automate access to websites protected by Cloudflare and similar challenge pages. It launches a real browser on demand to solve the challenge, then returns the final page content and/or the resulting cookies for reuse.

Key Features

• REST API for automated fetches that require solving Cloudflare or DDoS-GUARD challenges
• Headless browser automation using Selenium with an “undetected” Chrome driver approach
• Session management to reuse a browser profile and cookies across multiple requests
• Supports upstream proxies (including authenticated proxies) for outbound requests
• Can return full rendered HTML, response metadata, only cookies, or a rendered screenshot (Base64 PNG)
• Designed for containerized operation with official Docker images

Use Cases

• Integrating with automation tools (for example, indexers or scrapers) that need challenge-solving
• Fetching cookies to use with other HTTP clients after the browser completes the challenge
• Debugging challenge behavior by capturing rendered output or screenshots

Limitations and Considerations

• Each request may launch a new browser instance unless sessions are used, which can be memory-intensive
• Challenge-solving can fail or change over time as protection providers update their mechanisms

FlareSolverr is best suited for controlled automation scenarios where a real browser is required to pass anti-bot challenges. Used carefully with session reuse and sensible concurrency limits, it can provide reliable challenge handling behind a simple API.