How can I detect (using PHP) if a visitor to my website is connected through a proxy server?

Question

I want to know NOW if the visitor is connected through a proxy, not by looking at the stats.

Answer 1

Have you looked into the all new Google Analytics or use a CpanelX Avstats?

Answer 2

there are java based applets that will do this for you

www.google.com is your friend

also blacklist public proxy servers, most people that are connecting to web forums via proxy are there to cause problems or have already been banned. Most of the people that are going to waste their time going onto a site they're banned on don't have time to get their own proxies, so they use public ones.

Answer 3

You can detect the IP, but I don't think you can detect whether that IP is an originating send or a proxy. Sorta like detecting a letter has been remailed - sent from the writer to the remailing address, put in a new envelope and restamped...

If you were able to compare the IP to known proxies, you could eliminate (or identify) those...

Answer 4

they could detect the area call of your proxy and the area call of sites you visit. through utilising a proxy, as an party to view myspace they could be able to make certain something like right here index.Hypertext Preprocessor?q=d3d3Lm15c3BhY2UuY29t&hl=0 so that you're hidden in a fashion (they couldn't at the moment see you're on myspace) - in the journey that they are sensible & persist with this hyperlink they might comprehend you're vacationing myspace and so on The question is...do they comprehend who's surfying on what computer at what time? - (do you ought to login with a own username?, do you adjust the computer's that you employ or do you regularly use an same one?) maximum college's will comprehend absolutely everyone is viewing myspace through proxies, yet they gained't comprehend who's and at what time

Answer 5

There is simply no way to know for sure.

You know when someone is connecting through a proxy server when your server receives one of the following headers:

HTTP_VIA
HTTP_X_FORWARDED_FOR
HTTP_FORWARDED_FOR
HTTP_X_FORWARDED
HTTP_FORWARDED
HTTP_CLIENT_IP
HTTP_FORWARDED_FOR_IP
VIA
X_FORWARDED_FOR
FORWARDED_FOR
X_FORWARDED
FORWARDED
CLIENT_IP
FORWARDED_FOR_IP
HTTP_PROXY_CONNECTION

But there is no requirement for a proxy server to add any of these headers; proxy servers are allowed not to identify themselves to the world in general and to you in particular.

Answer 6

$_SERVER['HTTP_X_FORWARDED_FOR'] contains the IP address of the proxy server. By checking if it's set or not you could find out if the visitor uses a proxy. I say 'could', coz anonymous proxies don't use that.