Details include the following:
- proxy level
High Anonymous (Level 1): The web server can't detect whether you are using a proxy. Anonymous (Level 2): The web server can know you are using a proxy, but it can't know your real IP. Transparent (Level 3): The web server can know you are using a proxy and it can also know your real IP.
Secure websites whose url starts with https:// instead of http:// (ex. https://www.paypal.com) use the encrypted (SSL/HTTPS) connections between its web server and the visitors. Some proxies only support ordinary http sites and can't surf https sites.
If you are using a gateway proxy (eg. 126.96.36.199), it won't access the websites directly, it connects to another proxy (eg. 188.8.131.52) and then use that proxy to fetch the web pages for you. The web server will think your IP is 184.108.40.206, while you expect it to be 220.127.116.11.