apache2 rewrite rule without changing URL - apache

Question

This below rewrite redirects localhost to http://www.example.com/?id=211&test=1 but I want that localhost on browser should not be changed but the page will come form the above link.
I am using this rewrite rule on my Apache conf:
RewriteEngine On
RewriteCond %{HTTP_HOST} ^localhost$ [OR]
RewriteRule ^/?$ http://www.example.com/?id=211&test=1 [L]

Answer 1

This below rewrite redirects localhost to
http://www.example.com/?id=211&test=1 but I want that localhost on
browser should not be changed but the page will come form the above
link.
If you want to load a page from elsewhere without chaining the URL, mod_rewrite is the wrong tool for the job. Use mod_proxy instead. First enable it in Apache like this; example assumes you are on Ubuntu 12.04 but should work on most any Linux Apache install
sudo a2enmod proxy proxy_http
Then set this to enable a reverse proxy from your root path of / to http://www.example.com/?id=211&test=1:
<IfModule mod_proxy.c>
# Proxy specific settings
ProxyRequests Off
ProxyPreserveHost On
<Proxy *>
AddDefaultCharset off
Order deny,allow
Allow from all
</Proxy>
ProxyPass / http://www.example.com/?id=211&test=1
ProxyPassReverse / http://www.example.com/?id=211&test=1
</IfModule>
EDIT: Seems like mod_proxy and query strings for the destination do not mix; emphasis mine:
This directive allows remote servers to be mapped into the space of
the local server; the local server does not act as a proxy in the
conventional sense, but appears to be a mirror of the remote server.
The local server is often called a reverse proxy or gateway. The path
is the name of a local virtual path; url is a partial URL for the
remote server and cannot include a query string.
So if there is anyway you could set another page—maybe on localhost—that would bounce it behind the scenes. Meaning this happens on localhost:
ProxyPass / bounce.php
And then the file, bounce.php could have this line in it:
<?php
header('Location: http://www.example.com/?id=211&test=1');
?>
Which would allow mod_proxy to have a valid destination. And then the PHP file does the redirect? Hard to say, but the query string on your destination server is the issue.