Lighttpd

You must load mod_setenv before mod_redirect.

I just triple checked, "mod_setenv" is included in the server.modules settings and the following settings are setup for my server:

$HTTP["host"] =~ "angelomandato\.com$" {
setenv.add-response-header = ("X-Meaning-Of-Life"=>"42")
url.redirect = ( "^(.*)" => "http://angelo.mandato.com$0" )
}

When you go to angelomandato.com, one of the headers included in the redirect should be X-Meaning-Of-Life: 42 and it is not included. I'm using the Firefox Live HTTP Headers plugin. for my particular solution, I've added the following line just above the line with con->http_status = 301;

response_header_insert(srv, con, CONST_STR_LEN("My_Header_Title"), CONST_STR_LEN("My_Header_Value"));

It would be nice if this feature actually worked for redirects. I've also submitted a ticket to add 302 redirect option for Lighttpd 1.4.x branch but it was rejected. I would like the option reconsidered because 1.5.x series is classified as beta for many linux distributions which means if I want Lighttpd 1.5.x I have to compile it myself on all the servers I manage.

Did you actually try what stbuehler said and put mod_setenv before mod_redirect in the modules list?