Usually, the browser will send an "HTTP_X_FORWARDED_FOR" header when a proxy is used. In PHP, that will show up in the $_SERVER["HTTP_X_FORWARDED_FOR"] variable. I believe this there is a way to use a proxy without sending this header, but it may be a place to start.
The only other thing I can think of is blacklisting some known proxies.
TrafficNova posted this at 12:33 — 12th February 2011.
As a guy who wrote a proxy HTTP content filtering system last year. Don't ask me why it was a mad moment when I thought it could turn into a cool product.
The headers a proxy passes like HTTP_X_FORWARDED_FOR are entirely up to the proxies discretion whether they included or not. However pr0g4mm3r is correct that will probably detect a lot of them.
If the proxies are coming from a certain ip address you could probably block that ip address in cpanel but that would be almost impossible as there are many proxies.
This might be more accurate but it will probably still not be fool proof and there is a danger of false positives.
HTTP protocol through a proxy server stop. If you do not want to buy software, there is another way. You can insert a script in your site root htsaccess file. It is best to copy and paste the code, not type.
Lot of work but you can look up the IP number of the proxy and block that IP in your .htaccess file. You can block entire countries or an entire IP range the same way.
this is no way to force a proxy to honor your caching request, they are only
hints. if the proxyserver is ignoring the no-cache, url decoration is a
common way to invaldate the cache.
myurl.aspx?r=
just tack a new randowm number on every page request. (you will need to use
client code to rewrite the postback url if you are using asp.net's postback
model). a filter could also do the work.
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pr0gr4mm3r posted this at 12:26 — 7th February 2011.
He has: 1,502 posts
Joined: Sep 2006
Usually, the browser will send an "HTTP_X_FORWARDED_FOR" header when a proxy is used. In PHP, that will show up in the $_SERVER["HTTP_X_FORWARDED_FOR"] variable. I believe this there is a way to use a proxy without sending this header, but it may be a place to start.
The only other thing I can think of is blacklisting some known proxies.
TrafficNova posted this at 12:33 — 12th February 2011.
They have: 6 posts
Joined: Feb 2011
Hi,
As a guy who wrote a proxy HTTP content filtering system last year. Don't ask me why it was a mad moment when I thought it could turn into a cool product.
The headers a proxy passes like HTTP_X_FORWARDED_FOR are entirely up to the proxies discretion whether they included or not. However pr0g4mm3r is correct that will probably detect a lot of them.
If the proxies are coming from a certain ip address you could probably block that ip address in cpanel but that would be almost impossible as there are many proxies.
This might be more accurate but it will probably still not be fool proof and there is a danger of false positives.
function isProxy(){
return ($_SERVER['HTTP_X_FORWARDED_FOR'] || $_SERVER['HTTP_X_FORWARDED'] || $_SERVER['HTTP_FORWARDED_FOR'] || $_SERVER['HTTP_CLIENT_IP'] || $_SERVER['HTTP_VIA'] || in_array($_SERVER['REMOTE_PORT'], array(8080,80,6588,8000,3128,553,554)) || @fsockopen($_SERVER['REMOTE_ADDR'], 80, $errno, $errstr, 30));
}
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denniscrown posted this at 18:42 — 8th March 2011.
They have: 7 posts
Joined: Mar 2011
HTTP protocol through a proxy server stop. If you do not want to buy software, there is another way. You can insert a script in your site root htsaccess file. It is best to copy and paste the code, not type.
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johnpitter posted this at 10:04 — 11th March 2011.
They have: 7 posts
Joined: Mar 2011
You can block proxy server using some proxy software on your server and also using some IP address analyzing tools or software.
jacob2012 posted this at 12:30 — 1st June 2011.
They have: 5 posts
Joined: May 2011
Lot of work but you can look up the IP number of the proxy and block that IP in your .htaccess file. You can block entire countries or an entire IP range the same way.
C0ldf1re posted this at 12:34 — 13th June 2011.
They have: 20 posts
Joined: May 2011
Yes. Blocking out the Phillipines and Nigeria is always a good start.
yrsp007 posted this at 09:44 — 7th July 2011.
They have: 3 posts
Joined: Jul 2011
this is no way to force a proxy to honor your caching request, they are only
hints. if the proxyserver is ignoring the no-cache, url decoration is a
common way to invaldate the cache.
myurl.aspx?r=
just tack a new randowm number on every page request. (you will need to use
client code to rewrite the postback url if you are using asp.net's postback
model). a filter could also do the work.
Want to join the discussion? Create an account or log in if you already have one. Joining is fast, free and painless! We’ll even whisk you back here when you’ve finished.