Gordon Lyon estimates there are "hundreds of thousands" of open proxies on the Internet.
Wapedia offers the most recent version of every article, which is done by using a combination of a proxy-like behavior and a local article database.
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A bot herder usually uses a pseudonym to keep themselves anonymous, and may use proxy servers, shell accounts and bouncers to conceal their IP address thus maintaining anonymity.
Sysoev is best known as the creator and developer of nginx (pronounced Engine X), a HTTP, reverse proxy, and e-mail proxy server.
The German Pirate Party promptly opened a proxy server so that Arcor customers could continue to easily access YouPorn.
The MediaWiki software that Wikipedia runs on can interpret X-Forwarded-For (XFF) headers, allowing Wikipedia to identify a user's main IP address rather than the proxy IP address, allowing the ability to block proxy users individually by their client's IP rather than the proxy server IP (avoiding the need to block the whole proxy due to the actions of a single user).