What is the gateway feature of socks proxy?
If you are using a gateway proxy (eg. 22.33.44.55), it won’t access the websites directly, it connects to another proxy (eg. 22.33.44.1) and then use that proxy to fetch the web pages for you. The web server will think your IP is 22.33.44.1, while you expect it to be 22.33.44.55. If you want to be identified as two IP by the server, you should not use the gateway proxies. However it makes no difference if you only want to surf anonymously. Here is an example of gateway proxies.