CAPTCHA
A CAPTCHA is a check a website uses to try to tell a human from a program.
A CAPTCHA appears when a request looks suspicious to the site. There are many triggers: requests that are too frequent, a datacenter address, an unusual set of headers, disabled cookies or JavaScript.
A CAPTCHA by itself is not a block. It is a signal that the site noticed something unusual and asks for confirmation.
Frequent CAPTCHAs when working through a proxy usually mean one of two things: the request pace is too high or the site does not like the address type. First lower the frequency, then try a different proxy type.
A proxy does not solve CAPTCHAs and does not promise you will never see one: the site makes that decision. You must follow the rules of the site you work with.
FAQ
Does a proxy remove CAPTCHAs?
No. The site decides whether to show one. This depends on the request pace, the address type and how closely the request resembles one from a regular browser.
Why are there more CAPTCHAs through a datacenter proxy?
Some sites check requests from datacenters more closely, because ordinary visitors do not come from there.
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