There are two main types of Web proxy scripts. These are PHProxy and CGIProxy.
PHProxy
PHProxy or sometimes known as PHP proxy is a site that allows free and unchallenged access to social networking sites without a user name. This kind of proxy also allows access to government and corporate sites. Although PHProxy is useful for those who have security concerns with the different sites, it is most often taken advantage of by hackers or those who were denied access in their previous access attempts.
When you use a PHProxy, you will have the option of including a small URL form on your page. You can also remove scripting at the client side and accept HTTP cookies. You can show images and show the referring site in the HTTP headers. You can also strip meta-tags and strip site title if you like. Aside from these, you can also open another URL in a new window and be able to store cookies only for a particular session.
It is worth noting however that customization of other instances of the PHP proxy may lead to the reduction of anonymity and can result to revealing your original IP address. This will then defeat the purpose of using the proxy in the first place.
CGI Proxy
CGI means common gateway interface and this kind of proxy is installed on web servers using different protocols like HTTP, SSL and FTP. With this proxy, you will be able to access any resource from its server. It is very useful for anonymous proxies, virtual private network and for personal uses. It modifies links to point to the proxy and these include images, requests or any other access operation. It can also filter unwanted advertisements
A CGI proxy, or Common Gateway Interface proxy acts the same was a PHP proxy works, but what is going on behind the scenes is a little different. A CGI proxy uses a script written in the Perl programming language, and is parsed by Perl and not PHP. CGI proxies are better at passing on usernames and passwords to the destination website. This allows the user to log into websites that require a username and password to access. CGI proxies can respond quicker than a PHP proxy. But since the CGI proxy uses different resources to process the Perl script, it can be of much more load to the server. For this reason, CGI proxies are less common. Most Proxy Server hosts don’t allow the hosting of CGI proxies because of this possible excessive load it can task the server with. CGI proxies are the best for any site that requires a login, but are harder to find.