How to internally rewrite a page when requested from specific HTTP_HOST

How to internally rewrite a page when requested from specific HTTP_HOST - .htaccess files are extremely useful in many cases for users who either do not have root permissions or for users who simply aren't comfortable in making changes in their web server's configuration file. Trying to debug .htaccess not working isn't always the easiest thing to do, however, hopefully by checking the discuss below mentioned about apache, drupal, htaccess, mod-rewrite, .htaccess common problems as well as the troubleshooting tips, you'll have a better grasp on what you may have to modify to get your .htaccess file running smoothly.Problem :


I have a Drupal site, example.com, and our client has a campaign that they're promoting for which they've bought a new domain name, campaign.com. I'd like it so that a request for campaign.com internally rewrites to a particular page of the Drupal site. Note Drupal uses an .htaccess file in the document root.



The normal Drupal rewrite is



# Rewrite URLs of the form 'x' to the form 'index.php?q=x'.
RewriteCond %REQUEST_FILENAME !-f
RewriteCond %REQUEST_FILENAME !-d
RewriteCond %REQUEST_URI !=/favicon.ico
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]


I added the following before the normal rewrite.



# Custom URLS (eg. microsites) go here
RewriteCond %HTTP_HOST =campaign.com
RewriteCond %REQUEST_URI =/
RewriteRule ^ index.php?q=node/22 [L]


Unfortunately it doesn't work, it just shows the homepage. Turning on the rewrite log I get this.



1. [rid#2da8ea8/initial] (3) [perdir D:/wamp/www/] strip per-dir prefix: D:/wamp/www/ -> 
2. [rid#2da8ea8/initial] (3) [perdir D:/wamp/www/] applying pattern '^' to uri ''
3. [rid#2da8ea8/initial] (2) [perdir D:/wamp/www/] rewrite '' -> 'index.php?q=node/22'
4. [rid#2da8ea8/initial] (3) split uri=index.php?q=node/22 -> uri=index.php, args=q=node/22
5. [rid#2da8ea8/initial] (3) [perdir D:/wamp/www/] add per-dir prefix: index.php -> D:/wamp/www/index.php
6. [rid#2da8ea8/initial] (2) [perdir D:/wamp/www/] strip document_root prefix: D:/wamp/www/index.php -> /index.php
7. [rid#2da8ea8/initial] (1) [perdir D:/wamp/www/] internal redirect with /index.php [INTERNAL REDIRECT]
8. [rid#2da7770/initial/redir#1] (3) [perdir D:/wamp/www/] strip per-dir prefix: D:/wamp/www/index.php -> index.php
9. [rid#2da7770/initial/redir#1] (3) [perdir D:/wamp/www/] applying pattern '^' to uri 'index.php'
10.[rid#2da7770/initial/redir#1] (3) [perdir D:/wamp/www/] strip per-dir prefix: D:/wamp/www/index.php -> index.php
11.[rid#2da7770/initial/redir#1] (3) [perdir D:/wamp/www/] applying pattern '^(.*)$' to uri 'index.php'
12.[rid#2da7770/initial/redir#1] (1) [perdir D:/wamp/www/] pass through D:/wamp/www/index.php


I'm not used to mod_rewrite, so I might be missing something, but comparing the logs from a call to http://example.com/node/3 and from http://campaign.com/ I can't see any meaningful difference. Specifically the URI and args on line 4 seem correct, the internal redirect on line 7 seems right, and the pass through on line 12 seems right (because the file index.php exists). But for some reason it seems the query string's been discarded/ignored around the time of the internal redirect. I'm completely stumped.



Also, if anyone could provide a reference on understanding the rewrite log, that might help. It'd be great if there's a way to track the query string through the internal redirect.



FWIW I'm using WampServer 2.1 with Apache 2.2.17.


Solution :

The httpd.conf for campaign.com with it pulling data from example.com/macguffin/



<VirtualHost *:80>
ServerName campaign.com

<Proxy *>
    Order deny,allow
    Allow from all
</Proxy>

ProxyRequests Off
ProxyPreserveHost Off

ProxyPass / http://example.com/macguffin/
ProxyPassReverse / http://example.com/macguffin/

<Location />
    Order allow,deny
    Allow from all
</Location>
</VirtualHost>

Additionally, if you would like to do some further testing, give the htaccess tester tool a try. It allows you to specify a certain URL as well as the rules you would like to include and then shows which rules were tested, which ones met the criteria, and which ones were executed.

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