Network Protection: Support checks to database servers attached to Web clusters
When we use 'Server Load Balancing', we can do a http check on a URL.
When the server is up, and for example the database behind it is down, the user get a message the site is not found (error 404), on this moment the loadbalancer don't switch to the other server. When the loadbalancer check only on returncode 200 for the given site, the user don't get an error message and will be switched to the other server.
Bob Alfson commented
Have you tried the Web Application reverse proxy?