ErrorDocument when using Apache as reverse-proxy

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http://serverfault.com – 'evening, I have an Apache server (2.2.19) and a 4D Webstar server (kinda unknown HTTP server) on the same physical server. Apache only listens the SSL port (443) and is used as a reverse-proxy to 4DW (through a SSL VHost). Here are the two proxy directives I use : ProxyPass / timeout=15 connectiontimeout = 15 ProxyPassReverse / Given the fact that the 4DW server can go offline from time to time, i'd like to have a custom 503 error page to notify the users of the downtime or maintenance of the back-end app. Except Apache redirects everything f (HowTos)