What is ethical web scraping?
Ethical web scraping means collecting only the data you actually need, from sources you're allowed to collect it from, at a rate that doesn't degrade the site for other users. In practice that comes down to honoring robots.txt, throttling your request rate (polite crawling), skipping personal or login-protected content unless you have a lawful basis, and caching results so you don't re-fetch the same page over and over. It's the difference between a scraper that behaves like a well-behaved client and one that looks like an incident to the target's operations team.
| Practice | Ethical scraping | Aggressive scraping |
|---|---|---|
| robots.txt | Read and honor | Ignored |
| Request rate | Throttled, backs off on 429s | Max concurrency, no backoff |
| Data collected | Only fields the use case needs | Everything on the page |
| Personal data | Avoided or minimized, lawful basis documented | Collected freely |
| Caching | Results reused across runs | Every run re-fetches |
| Identification | Recognizable user-agent, contact info if requested | Spoofed browser fingerprints |
Apply these practices whenever you're pulling data from a site you don't own: public catalogs, docs, listings, review sites, or anywhere you'd want another team to treat your own site with the same care. Aggressive patterns are what get scrapers blocked, referred to legal, or cited in press coverage, and none of that is worth the extra throughput.