Proxies for web scraping
Most scraping failures are not IP problems. Work out which one yours is before you change the IP class, because changing it is usually not the fix.
The problem
A scraper that worked yesterday starts returning blocks, empty pages or captchas. The instinct is to buy better proxies, and often that is the wrong diagnosis.
Three different failures look identical from the outside: the IP class was rejected, the request rate was too high, or the request itself looked automated regardless of where it came from.
Only the first is solved by changing proxy type. The second is solved by slowing down and the third by fixing your client — and since every type bills at the same rate, escalating the IP class is not even an expensive way to be wrong. It is just an ineffective one.
What we would configure
- Start with
- Datacenter, per-request rotation
- Escalate to
- Residential, only if datacenter is rejected
- Rotation
- Per request for stateless pages; sticky for paginated flows
- Targeting
- Country only, unless the content actually varies by city
- Protocol
- HTTP unless your client needs SOCKS5
Datacenter has the shortest, most predictable route, and it costs exactly what everything else costs. That makes it the free experiment: if the target accepts it, you have your answer in minutes and nothing to reconsider later.
A real connection
Built from the same parameter grammar the network accepts — copy it and change the country.
user-USERNAME-type-datacenter-country-us-rotation--1Clean responses here mean the IP class was never the constraint, and you keep the fastest route. Change type-datacenter to type-residential only once you have watched this one fail.
What goes wrong
- Rotating mid-pagination, which resets the server-side state the site was holding for you
- Requesting city-level targeting when the content is identical nationwide — narrower targeting for no gain
- Blaming the proxy for a block that was caused by request rate or a missing header
- Collecting full pages when an API or a partial response would carry the same data for a fraction of the bytes — you are billed by the byte
Questions
- How many proxies do I need?
- The wrong unit. You buy gigabytes, not addresses, and rotation draws from the pool as needed. What matters is how many bytes your job moves — so fetching an API response instead of a full rendered page is the single biggest lever on cost.
- Does a proxy solve captchas?
- No. A captcha means the target already decided the request was suspicious. A better IP class can reduce how often you are challenged, but it does not answer the challenge.
- Do headless browsers use more traffic?
- Considerably. A browser loads images, fonts, stylesheets and analytics — often several megabytes where the data you wanted was a few kilobytes of JSON. Block unnecessary resource types and your bill drops accordingly.