What is a proxy?
A proxy is a server which, when connected to, will pass requests back and forth as an intermediary, a middle man. Proxies come in three flavors: proxies, php proxies, and cgi proxies.
How do I select a proxy?
The first choice that needs to be made is the type of proxy you want to use: transparent, anonymous, or high anonymity.
A transparent proxy do not hide the address of your computer.
REMOTE_ADDR = proxy IP
HTTP_VIA = proxy IP
HTTP_X_FORWARDED_FOR = your IP
An anonymous proxy hide your IP, however, they do not hide the fact they are hiding your IP.
REMOTE_ADDR = proxy IP
HTTP_VIA = proxy IP
HTTP_X_FORWAREDED_FOR = proxy IP
A high anonymity proxy is not detectable by headers.
REMOTE_ADDR = proxy IP
HTTP_VIA = not determined
HTTP_X_FORWAREDED_FOR = not determined
Also, location plays a key roll in the speed you will have when using the proxy. A proxy WILL slow down your connection, but how much is up to you.
How do I use a proxy?
Can I use more than one proxy?
Yes, you can in fact use more than one proxy. You can build a proxy chain to increase the computers between you and the target or host.
A common way to do this is using both a proxy and a CGI or PHP proxy. Once you have set your browser to connect to the proxy, open the webpage for the CGI or PHP proxy.
You can even point one CGI or PHP proxy at another...and another...and another. The downside is decreased speed and more likelyhood that something in between will get cached, however; it will put X more computers and IPs inbetween you and the computer you are connecting to.