•When a user reaches the VIP via http://dns1.com for which application is down, he must be redirected to http://dns2.com
•On this dns2.com service, we will display a “sorry-page” depending on the original URL entered (dns1.com). For this we need the info either
oVia HTTP_REFFERER HTTP header (http://en.wikipedia.org/wiki/HTTP_referer) which will contain ‘http://dns1.com’ value (but it looks like F5 removes this information)
oVia a GET parameter : user must be redirected to http://dns2.com/?origin=http://dns1.com , where origin parameter is the original URL entered by the user.
Nimbostratus