RewriteRule ^/inteproxy\-demo\.intevation\.org\/cgi\-bin\/frida\-wms$ https:/$0?user=meier&password=meier [QSA,P]
RewriteRule ^/www\.geobasisdaten\.niedersachsen\.de\/mapgate\/.*$ https:/$0?user=USERNAME&password=PASSWORT [QSA,P]
Substitute s!https?://(inteproxy\-demo\.intevation\.org\/cgi\-bin\/frida\-wms|www\.geobasisdaten\.niedersachsen\.de\/mapgate\/[^"]*)!http://SERVERNAME:64609/$1!