What is CoDeeN/Planetlab proxy?
CoDeeN/Planetlab proxies usually don’t support all HTTP types, which means that you can’t login forums, download files or surf https sites. Besides, you may be asked to input digits or click links to identify yourself as a human, not a robot. They have many limitations, but you can at least use them to surf most ordinary websites. See more information here: http://forum.my-proxy.com/proxy-questions/about-the-codeenplanetlab-proxies-t94.0.html.