Adding properly formatted headers to maintenance messages

A few tings to consider:

1. First, Headers are inserted AFTER content in the HTTP::respond command:

when HTTP_REQUEST {
if { ( [active_members [LB::server pool]] == 0 ) or ( [HTTP::uri] equals "/maintenance.htm" ) } {
HTTP::respond 503 content "blah" "Retry-After" 5 "Connection" "Close"
}
}

2. The Retry-After header value is in seconds, so 10800 is 3 hours.

3. I don't know of ANY browser that pays attention to this header. I've read that some web spiders do (ex. Googlebot), but that's about it.

4. If this is for browser-based traffic, I'd probably recommend something like a meta-refresh header in the maintenance page that redirected back to the site. You could even dynamically fill the refresh header with the last URI requested.