Scraping Architecture

Four handoff patterns determine where web crawlers normalize data before it reaches AI consumers.

Selenium's browser automation creates silent failures that modern data pipelines can't tolerate.

Playwright's auto-waiting and multi-language support make it the better choice for new projects.

Crawl maps unknown terrain; fetch retrieves known pages.

Matching crawl frequency to how fast pages actually change prevents silent pipeline failures.

Most production RAG systems fail silently because crawling only solves half the freshness problem.

LLMs need clean data from day one, or noise compounds across nine pipeline layers.