Rewriting HTTP responses

Suppose that you wanted to publish an internal website (http://intranet.mycorp.com/) so that it can be accessed externally (with the correct access controls and security of course!). However, the domain name internal.mycorp.com is not valid externally, and you want to refer to the site via the URL https://extranet.mycorp.com.

One key requirement is to rewrite any HTML that includes references to intranet.mycorp.com, so that they refer to extranet.mycorp.com. The following response rule will do this:

# We only want to process text/html responses (ie, not images or other types)
if( http.getResponseHeader( "Content-Type" ) != "text/html" ) break;
 
$response = http.getResponseBody();
 
# replace 'http://intranet.mycorp.com/' with 'https://extranet.mycorp.com/'
$response = string.regexsub( $response,
   "http://intranet.mycorp.com/", "https://extranet.mycorp.com/", "g" );
 
http.setResponseBody( $response );

Here's a briefer version that works with current versions of Zeus Traffic Manager:

if( !string.startsWith( http.getResponseHeader( "Content-Type" ), "text/html" ) )
    break;
 
$response = http.getResponseBody();
 
$response = string.replaceAll( $response,
   "http://intranet.mycorp.com/", "https://extranet.mycorp.com/" );
 
http.setResponseBody( $response );

Owen Garrett [Zeus Dev Team] 01 July 2005 8 comments