Transparently redirecting clients from http://domain.com/ to http://www.domain.com/

Here's how to accomplish vanity domain names within ZXTM. Many popular websites will respond to a http://domain-name.com/ request, but will issue a 301 re-direct to http://www.domain-name.com/. Let's demonstrate how ZXTM can quickly and easily accommodate this requirement, including transparently re-writing any URL request.

# Cache Host header being issued by the client
$host = http.getHeader( "Host" );

# This line passes both the path and query string to $url, meaning that
# a request for /path/to/output?is-here.php is placed into the below variable.
$url = http.getRawURL();

# log.info( "url: ".$url ); #  Optional log output

# Use a Perl Compatible regular expression to match our domain name.  
if( string.regexmatch( $host, "^domain-name$" ) ) {

# Re-write the variable cached in $host to include a prefix of 'www.'
$location = string.regexsub( $host, "domain-name.com", "www.".$host );

# Issue a permanent re-direct to the client (Google requires a 301 response code to 
# ensure a request for http://domain-name/ is included within 
# http://www.domain-name/'s rankings.

http.sendResponse( "301 Moved Permanently", "text/html", "",

# Catenate the newly created $location variable with the original $url query request
"Location: http://".$location.$url);
}

Here's our final trafficscript in full vim syntax glory:

Chris Buckley [Zeus Support] 04 August 2006   1 comment