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    href="#name">name-based</a> example, setup 2) should get its own IP

    address. To avoid problems with name servers or proxies who cached the

    old IP address for the name-based vhost we want to provide both

    variants during a migration phase.<br />

    variants during a migration phase.</p>

    <p>

     The solution is easy, because we can simply add the new IP address

    (<code>172.20.30.50</code>) to the <code>VirtualHost</code>

    directive.</p>

    <code>http://www.sub1.domain.tld/</code> is only

    served from the sub1-vhost if the client sent a correct

    <code>Host:</code> header. If no <code>Host:</code> header is sent the

    client gets the information page from the primary host.<br />

     Please note that there is one oddity: A request to

    client gets the information page from the primary host.</p>

    <p>Please note that there is one oddity: A request to

    <code>http://www.sub2.domain.tld/sub1/</code> is also served from the

    sub1-vhost if the client sent no <code>Host:</code> header.<br />

     The <directive module="mod_rewrite">RewriteRule</directive> directives

    sub1-vhost if the client sent no <code>Host:</code> header.</p>

    <p>The <directive module="mod_rewrite">RewriteRule</directive> directives

    are used to make sure that a client which sent a correct

    <code>Host:</code> header can use both URL variants, <em>i.e.</em>,

    with or without URL prefix.</p>