Redirect but keep url in address bar
<p>I am trying to redirect a page from demo.example.com to demo1.example.com but to keep the demo.example.com in the url address bar (I own both of the domains). I read that in order to do that I need to use mod_proxy but I dont know where I should write rules and what I should write. I tried with .htaccess but not luck:</p>

<pre><code>&lt;IfModule mod_rewrite.c&gt;
  RewriteEngine On
  RewriteRule ^(.*) http://demo1.example.com/$1 [P]
&lt;/IfModule&gt;
</code></pre>

<p>In my apache services I have the following options:</p>

<pre><code>proxy 
proxy_ajp 
proxy_balancer
proxy_connect 
proxy_express 
proxy_fcgi 
proxy_fdpass 
proxy_ftp 
proxy_html 
proxy_http
proxy_scgi 
proxy_wstunnel
</code></pre>

<p>I am using ubuntu server with apache and plesk </p>