Rewriting responses with "Generic Client First" and "Generic Server First" protocols

TrafficScript HTTP functions are not available when using the "Generic Client First" and "Generic Server First" protocols. However, you may want to use TrafficScript rules to rewrite response headers, such as "Location" redirects.

The TrafficScript rule below rewrites the "Location" header to prevent the client from being redirected to an unsecure URL.

This rule shows how we can use non HTTP functions within TrafficScript to achieve the same type of functionaility that would be available when using the HTTP protocol.

# read until we are sure we have all the headers in the buffer
$r = response.getLine( "\r?\n\r?\n" );

# now read the entire response buffer
$r = response.get();

# regular expression rewrites the Location header
$s = string.regexsub( $r, "Location: http://www.example.com", "Location: https://www.example.com" );

# set the new response
response.set( $s );

Remember to set this as a response rule and associate it with the appropriate Virtual Server.

Graham Moore [Zeus Systems Engineering] 05 June 2006   2 comments