Lighttpd

Hello,
I'm quite new with lighttpd.
I'm using it in a board using an ARM microprocessor with Debian on board.

I'heve developed a web app using the fat free framework and it works fine inside my local network.
I'm now tring to make the web app accessible from outside the local network.
So I have a port forwarding on the router to give access to the web server inside my local network.
So now the web server is accessible from to outside to the address xxx.vfdns.org:7777

The problem is that when I perform a "reroute" to the /login route from my webapp the web app routes to the (wrong) url xxx.vfdns.org/login and not to the (right) url xxx.vfdns.org:7777/login.

This of course result in URL not found. If I add manually the port(7777) the url is ok.

The question is how modify the url.rewrite-once rule to add always the port 7777 (is not already present) when accessing the url xxx.vfdns.org?

The actual lighttpd.conf is:

server.modules = (
    "mod_indexfile",
    "mod_access",
    "mod_alias",
     "mod_redirect",
)

server.document-root        = "/var/www/fatfree" 
server.upload-dirs          = ( "/var/cache/lighttpd/uploads" )
server.errorlog             = "/var/log/lighttpd/error.log" 
server.pid-file             = "/var/run/lighttpd.pid" 
server.username             = "www-data" 
server.groupname            = "www-data" 
server.port                 = 80

# strict parsing and normalization of URL for consistency and security
# https://redmine.lighttpd.net/projects/lighttpd/wiki/Server_http-parseoptsDetails
# (might need to explicitly set "url-path-2f-decode" = "disable" 
#  if a specific application is encoding URLs inside url-path)
server.http-parseopts = (
  "header-strict"           => "enable",# default
  "host-strict"             => "enable",# default
  "host-normalize"          => "enable",# default
  "url-normalize-unreserved"=> "enable",# recommended highly
  "url-normalize-required"  => "enable",# recommended
  "url-ctrls-reject"        => "enable",# recommended
  "url-path-2f-decode"      => "enable",# recommended highly (unless breaks app)
 #"url-path-2f-reject"      => "enable",
  "url-path-dotseg-remove"  => "enable",# recommended highly (unless breaks app)
 #"url-path-dotseg-reject"  => "enable",
 #"url-query-20-plus"       => "enable",# consistency in query string
)

index-file.names            = ( "index.php", "index.html" )
url.access-deny             = ( "~", ".inc" )
static-file.exclude-extensions = ( ".php", ".pl", ".fcgi" )

compress.cache-dir          = "/var/cache/lighttpd/compress/" 
compress.filetype           = ( "application/javascript", "text/css", "text/html", "text/plain" )

# default listening port for IPv6 falls back to the IPv4 port
include_shell "/usr/share/lighttpd/use-ipv6.pl " + server.port
include_shell "/usr/share/lighttpd/create-mime.conf.pl" 
include "/etc/lighttpd/conf-enabled/*.conf" 

#server.compat-module-load   = "disable" 
server.modules += (
    "mod_compress",
    "mod_dirlisting",
    "mod_staticfile",
)

url.rewrite-once = ( "^/(.*?)(\?.+)?$"=>"/index.php/$1?$2" )
server.error-handler-404 = "/index.php" 

=========================================================================================

The versione of lighttpd is lighttpd/1.4.53 (ssl) - a light and fast webserver

Thanks in advance.
Enzo