Cloudflare Blocking Your Requests? Read The Signal First

Read the code before you change anything

Cloudflare tells you a lot if you look at what you got back.

403 with a challenge page — the request was scored as automated. Fingerprint and network, not rate.

429 — you are simply too fast. Slow down; changing IP does not fix a rate problem, it spreads it.

503 with an interstitial — a JavaScript challenge you never executed.

1020 (Access Denied) — a firewall rule matched. Often the country, the ASN, or a path the site protects. A different IP in a different network may pass; the same IP never will.

1015 — rate limiting configured by the site owner, per IP.

Changing your proxy fixes exactly one of these categories reliably. The rest are about how you are making the request.

What Cloudflare actually inspects

The TLS handshake, which fingerprints your HTTP client independently of the user agent. Header presence and order. Whether the challenge JavaScript runs and returns a plausible result. IP reputation, which is the aggregate behaviour of everything else on that address. And how the session behaves over time.

The fixes that hold

Use a real browser engine for anything that serves a JavaScript challenge. No HTTP library will pass one, regardless of the proxy.

Match the fingerprint to the exit. IP in Spain means Spanish locale, a Madrid timezone and a matching Accept-Language. Consistency is the whole game.

Slow down and stagger. Randomised gaps between requests, low concurrency per host, exponential backoff after the first challenge.

Use residential exits for consumer sites, and keep sessions sticky so the site sees one visitor rather than a new stranger every request.

Cache aggressively. The request you never make cannot be blocked, and it costs no bandwidth.

When you should stop

If a site's firewall rule targets your use case, or robots.txt disallows the path, that is the answer. Sites are entitled to say no; work with the ones that publish data openly, or ask for API access.