Rewrite domains w\ RewriteMap

gistfile1.txt

<VirtualHost *:80>
        ServerAdmin webmaster@localhost

        RewriteEngine   On

        RewriteMap      exampledomain           txt:/etc/apache2/domains.txt
        RewriteRule     ^/$                     ${exampledomain:%{HTTP_HOST}}

        RewriteLog /var/log/apache2/rewrite.log
        RewriteLogLevel 5

        ErrorLog ${APACHE_LOG_DIR}/error.log

        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

gistfile2.txt

www.example.com         https://test.com/from-example
jenkins.example.com     https://ci.example.com
localhost               https://test.com