What is the difference between 401 and 403?

401 means you need to authenticate; logging in can fix it. 403 means the server refuses even with authentication, for this client, IP or resource.

Why do I get 403 with a proxy but not without?

The site is reacting to the proxy request: its IP range or reputation, its location, or a client fingerprint that differs from your normal browser. Compare headers and try a different IP type.

Sometimes. A 403 for every page from one IP, while other IPs work, points to an IP or range block. A 403 on one page only is usually a permission rule.

Can a proxy itself return 403?

Yes. Some proxies answer 403 when your IP is not authorised or a destination is blocked. If curl reports the error while opening the CONNECT tunnel, it came from the proxy.

How do I fix a 403 error when scraping?

Send realistic headers from a consistent client, slow down, use IPs suited to the site such as residential or ISP, and check whether the site allows automated access to that data at all.

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What Is the 403 Forbidden Error?

403 Forbidden is the HTTP status code a server returns when it understood the request but refuses to fulfil it. Unlike a 401, logging in will not help: the server has decided this client, IP or request is not allowed.

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how it works

How a 403 differs from other errors

RFC 9110 defines 403 as a refusal that new credentials won't fix. Servers use it for real permission rules, such as a private folder, and anti-bot and firewall systems use it to block traffic they don't trust. Many return a 404 instead, to avoid revealing that a page exists.

1
401 Unauthorized
Means
Log in first
Usually comes from
The website
403 Forbidden
This term
Means
You may not have this, whoever you are
Usually comes from
The website, its CDN or WAF, or the proxy
407 Proxy Authentication Required
Means
The proxy wants credentials
Usually comes from
The proxy
4
429 Too Many Requests
Means
Slow down
Usually comes from
The website's rate limiter

why it matters

Why you get a 403 through a proxy

When a request works without the proxy but returns 403 through it, the site is reacting to something about the proxied request. Find out which.

403 Forbidden: what it means for you

The IP or its network: hosting ASNs, ranges on blocklists or an IP with poor reputation.
Location: the site serves only some countries, a form of geo-blocking.
The client: missing or inconsistent headers, a library's default User-Agent, or a non-browser TLS fingerprint.
Behaviour: too many requests, or a pattern that matches automation.
The proxy itself: some providers return 403 when your IP is not allowlisted or a destination is restricted. Errors during CONNECT come from the proxy, not the site.

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Check who sent the 403

Look at the response, not just the code. A body that names a CDN or security vendor, or headers such as server: cloudflare with a cf-ray ID, mean the site's edge blocked you. A failure while opening the tunnel means the proxy refused.

If the site blocks hosting ranges, consumer IPs help: CleanProxies rotating residential proxies in 190+ countries and static ISP proxies on US carrier networks. Respect sites that refuse automated access, and read the proxy errors guide for the other codes.

Headers and tunnel status with curlShell

curl -sv -o /dev/null \
  -x http://USERNAME:PASSWORD@HOST:PORT \
  https://example.com 2>&1 \
  | grep -Ei '^< (HTTP|server|cf-ray)|CONNECT'

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