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A CGI proxy client sends the requested url embedded within the data portion of an HTTP request to the CGI proxy server. The CGI proxy server pulls the ultimate destination information from the data embedded in the HTTP request, sends out its own HTTP request to the ultimate destination, and then returns the result to the proxy client. A CGI ...
The software works by creating an encrypted HTTP tunnel between the user's computer and a central pool of proxy servers, enabling users to bypass firewalls and censorship. [9] UltraReach hosts all of its own servers. [9] The software makes use of sophisticated, proprietary anti-blocking technology to overcome filtering and censorship online. [9]
Privoxy is a "privacy enhancing proxy", filtering web pages and removing advertisements. Privoxy can be customized by users, for both stand-alone systems and multi-user networks. [2] Privoxy can be chained to other proxies and is frequently used in combination with Squid among others and can be used to bypass Internet censorship. [3]
Some software may be bypassed successfully by using alternative protocols such as FTP or telnet or HTTPS, conducting searches in a different language, using a proxy server or a circumventor such as Psiphon. Also cached web pages returned by Google or other searches could bypass some controls as well.
Psiphon is a centrally managed and geographically diverse network of thousands of proxy servers, using a performance-oriented, single- and multi-hop routing architecture. [ 1 ] Psiphon is specifically designed to support users in countries considered to be "enemies of the Internet". [ 2 ]
Unix-like operating systems commonly implement IP address blocking using a TCP wrapper, configured by host access control files /etc/hosts.deny and /etc/hosts.allow.. Both companies and schools offering remote user access use Linux programs such as DenyHosts or Fail2ban for protection from unauthorized access while allowing permitted remote access.
Lantern is a free and open source [4] internet censorship circumvention tool that operates in some of the most extreme censorship environments, such as China, Iran, and Russia. [5]
The meaning of "a resource which cannot be served for legal reasons" has been interpreted to extend beyond government censorship: When content cannot be shown in the user's country, due to contractual or licensing restrictions with the content owner, for example, a TV program may not be available to users in some countries.