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Accepted
Steve Robbins
Asked: 2013-11-07 19:52:45 +0800 CST

ProxyPass for specific vhost with mod_rewrite

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I have a web server that it set up to dynamically server different document roots for different domains

<VirtualHost *:80>
    <IfModule mod_rewrite.c>
        # Stage sites :: www.[document root].server.company.com => /home/www/[document root]
        RewriteCond   %{HTTP_HOST}          ^www\.[^.]+\.server\.company\.com$
        RewriteRule   ^(.+)                 %{HTTP_HOST}$1          [C]
        RewriteRule   ^www\.([^.]+)\.server\.company\.com(.*) /home/www/$1/$2  [L]
    </IfModule>
</VirtualHost>

This makes it so that www.foo.server.company.com will serve the document root of server.company.com:/home/www/foo/

For one of these sites, I need to add a ProxyPass, but I only want it to be applied to that one site. I tried something like

<VirtualHost *:80>
    <Directory /home/www/foo>
        UseCanonicalName Off
        ProxyPreserveHost On
        ProxyRequests Off
        ProxyPass /services http://www-test.foo.com/services
        ProxyPassReverse /services http://www-test.foo.com/services
    </Directory>
</VirtualHost>

But then I get these errors

ProxyPreserveHost not allowed here

ProxyPass|ProxyPassMatch can not have a path when defined in a location.

How can I set up a ProxyPass for a single virtual host?

apache-2.2

2 Answers

  1. Best Answer

    Just move the ProxyPass out of the <Directory> block - if it's in that context, it's expected that it applies to that exact context (instead of the /services you want it to apply for).

    Actually, you're not doing anything with that block at all, it looks like?

    <VirtualHost *:80>
    UseCanonicalName Off
    ProxyPreserveHost On
    ProxyRequests Off
    ProxyPass /services http://www-test.foo.com/services
    ProxyPassReverse /services http://www-test.foo.com/services
    # and if you do need to serve from /home/www/foo...
    DocumentRoot /home/www/foo
    <Directory /home/www/foo>
        Order allow,deny
        Allow from all
    </Directory>
</VirtualHost>

    edit: Missed that it's not actually virtual hosts - your example where it's just a directory in a virtual host block made me think they were separate.

    In that case...

    ProxyPreserveHost On
# If it's not already:
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.foo
RewriteRule ^/services(.*) http://www-test.foo.com/services$1 [P,L]
ProxyPassReverse /services http://www-test.foo.com/services
    • 3

  2. Use a New VirtualHost

    If you add a new VirtualHost above your current one and specify the domain in ServerName, you can then proxy that specific domain.

    You may need to add a NameVirtualHost if you are on Apache prior to version 2.3.11.

    <VirtualHost *:80>
        ServerName www.targetdomain.com
        ProxyPreserveHost On
        ProxyPass /services http://www-test.foo.com/services
        ProxyPassReverse /services http://www-test.foo.com/services

    <IfModule mod_rewrite.c>
        # Stage sites :: www.[document root].server.company.com => /home/www/[document root]
        RewriteCond   %{HTTP_HOST}          ^www\.[^.]+\.server\.company\.com$
        RewriteRule   ^(.+)                 %{HTTP_HOST}$1          [C]
        RewriteRule   ^www\.([^.]+)\.server\.company\.com(.*) /home/www/$1/$2  [L]
    </IfModule>
</VirtualHost>

    I recommend setting ProxyRequests Off at the server level.

    When Apache tries to match domain names it does so on a first match basis. The first match (VirtualHost, ServerName, or ServerAlias) in the configuration file will be the one used to route the traffic. There is no special treatment for wildcards, so any specific server name declarations need to appear before your wildcard virtual host.

    ProxyPreserveHost is permitted only in the Server and VirtualHost context. So if you must use that directive, you will need to place it in a new VirtualHost.

    • 1