I rarely use this information in my program for serious purposes so I just stuff with REMOTE_HOST || REMOTE_ADDR, which will give me at least the IP address. If the request came by proxy than I would get that proxy IP address instead. I know there exists HTTP headers to distinguish these proxies in between, but I'll always have to lookup the references over the Internet to recall again about HTTP_VIA and HTTP_X_FORWARDED_FOR.
Here's a page discussing various proxy types and how they fill in those related HTTP headers. It would tell you right away your IP address, whether you're coming by a proxy, and if so, the proxy's IP address as well. You seem to have really consider it if you need accurate remote host or IP address information.
Open source softwares? Share and enjoy. Make profit from them if you can. Yet, share and enjoy!
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