Lighttpd

I installed lighttpd on my Raspberry (OS: Raspbian GNU/Linux 10 (buster)) in the usual way and installed the modules cgi and userdir. In /var/www/html I created the file test.html. If I enter localhost/test.html in the browser window (Chromium as browser), the content of the test file appears. However, if I enter localhost or localhost:80, the message '403 Forbidden' appears. When I enter localhost/test.html the test.html content is shown in the browser (Chromium)

Version lighttpd: lighttpd/1.4.53

Access rights of the folders and files:

ls -al /var/www
insgesamt 12
drwxrwxr-x  3 www-data www-data 4096 Sep 24 14:24 .
drwxr-xr-x 12 root     root     4096 Sep 24 14:24 ..
drwxrwxr-x  2 www-data www-data 4096 Sep 24 15:14 html

Content of lighttpd.conf:

sudo lighty-enable-mod userdirserver.modules = (
    "mod_indexfile",
    "mod_access",
    "mod_alias",
     "mod_redirect",
)

server.document-root        = "/var/www/html" 
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",
)

Content of /var/log/lighttp/errorlog:

2019-09-24 14:25:50: (server.c.1464) server started (lighttpd/1.4.53) 
2019-09-24 14:28:12: (server.c.958) [note] graceful shutdown started 
2019-09-24 14:28:12: (server.c.2059) server stopped by UID = 0 PID = 14428 
2019-09-24 14:28:12: (server.c.1464) server started (lighttpd/1.4.53) 
2019-09-24 15:02:36: (server.c.958) [note] graceful shutdown started 
2019-09-24 15:02:36: (server.c.2059) server stopped by UID = 0 PID = 17667 
2019-09-24 15:02:36: (server.c.1464) server started (lighttpd/1.4.53) 
2019-09-24 15:03:56: (server.c.958) [note] graceful shutdown started 
2019-09-24 15:03:56: (server.c.2059) server stopped by UID = 0 PID = 17773 
2019-09-24 15:03:56: (server.c.1464) server started (lighttpd/1.4.53) 
2019-09-24 15:08:09: (server.c.958) [note] graceful shutdown started 
2019-09-24 15:08:09: (server.c.2059) server stopped by UID = 0 PID = 17859 
2019-09-24 15:08:09: (server.c.1464) server started (lighttpd/1.4.53) 
2019-09-24 17:29:08: (server.c.958) [note] graceful shutdown started 
2019-09-24 17:29:08: (server.c.2059) server stopped by UID = 0 PID = 20484 
2019-09-24 17:29:08: (server.c.1464) server started (lighttpd/1.4.53) 
2019-09-24 17:42:02: (server.c.2059) server stopped by UID = 0 PID = 1 
2019-09-24 17:42:04: (server.c.1464) server started (lighttpd/1.4.53)