Home / server / Questions / 684612
In Process
ZZ9
Asked: 2015-04-23 02:15:47 +0800 CST

How to redirect FORWARD proxy users to webpage using mod_proxy - apache

  • 772

I have searched quite a lot for a solution and most answers pertain to either proxypass (reverse proxy) or are not relevant.

End users' web browsers are configured to use the Apache proxy server.

I want to redirect all users to an individual web page (on the same server if possible).

Mod_rewrite does not work as it is only triggered when a user tried to visit the proxy server. I want to redirect users trying to access external sites.

The current configuration is simple:

/var/httpd/conf.d/proxy.conf:

<VirtualHost *:*>
    ProxyRequests On
    ProxyVia On

    <Proxy *>
        Order deny,allow
        Deny from all
        Allow from 172.0.0.0/21
    </Proxy>
</VirtualHost>

I was thinking of blocking all requests and then setting a custom error page but cannot find any examples of this working.

web-server

1 Answers

  1. I haven't tried output filters with forward proxying, but it works with reverse proxying, so you might want to give the following a try:

    #add this outside of any VirtualHost tags
ExtFilterDefine proxiedcontentfilter mode=output cmd="/usr/bin/php /var/www/proxyfilter.php"

#add this in your VirtualHost tag
SetOutputFilter proxiedcontentfilter

In proxyfilter.php have some code like the following:

#!/usr/bin/php
<?php
$html = file_get_contents('php://stdin');
#update this if-condition to match any non-internal hostnames
if ($_SERVER['HTTP_HOST'] != 'www.example.com') {
    header('Location: http://localserver/message_to_display.html');
    $html = '';
}

file_put_contents('php://stdout', $html);
    • 0