Why am I getting blocked when scraping product pages at scale?

You’re usually getting blocked because the target site sees your scraping as bot-like, high-risk, or abusive traffic. At scale, even “normal” page requests can trigger defenses.

Common reasons:

• Too many requests too fast
  High request rates, no pacing, or bursts from the same IP/session are easy to flag.

• Predictable behavior
  Scraping pages in a strict sequence, using identical headers, same timing, same navigation pattern, or never loading assets can look automated.

• IP reputation or concentration
  Many requests from one IP, one cloud provider, or a datacenter range often gets blocked faster than residential traffic.

• Missing browser signals
  Sites may expect cookies, JavaScript execution, modern headers, and asset loading. Raw HTTP clients can stand out.

• Fingerprinting and bot detection
  Sites inspect TLS/HTTP fingerprints, header order, browser APIs, canvas/WebGL, mouse/scroll events, and more.

• Session/account abuse signals
  Reusing one account, one cookie jar, or one API key across too much activity can trigger rate limits or bans.

• Robots / access policy enforcement
  Some sites explicitly disallow scraping or enforce terms through technical controls.

• WAF / anti-bot systems
  Cloudflare, Akamai, PerimeterX, DataDome, etc. can challenge, throttle, or block suspicious traffic.

What you can do, in a legitimate and compliant way:

• Check for an official API or feed first
• Reduce request rate and add backoff/jitter
• Cache aggressively and avoid re-fetching unchanged pages
• Respect robots.txt and site terms
• Use conditional requests like If-Modified-Since / ETag where allowed
• Stagger workloads instead of hitting pages in large bursts
• Monitor status codes like 429, 403, 503, and response headers for rate-limit hints
• Coordinate with the site if you need large-scale access; many publishers offer bulk data access or whitelisting

If you want, I can help you diagnose the specific block pattern from the status codes, headers, timing, and whether you’re using browser automation or raw HTTP.