<Directory "/Library/WebServer/Documents">

#
# This may also be "None", "All", or any combination of "Indexes",
# "Includes", "FollowSymLinks", "ExecCGI", or "MultiViews".
# 
# Note that "MultiViews" must be named *explicitly* --- "Options All" 
# doesn't give it to you.
# 
    Options Indexes FollowSymLinks MultiViews
 
# 
# This controls which options the .htaccess files in directories can
# override. Can also be "All", or any combination of "Options", "FileInfo",  
# "AuthConfig", and "Limit"
# 
    AllowOverride None

# 
# Controls who can get stuff from this server.
# 
    Order allow,deny
    All from all
</Directory>

and change it to:

<Directory "/Library/WebServer/Documents">

#
# This may also be "None", "All", or any combination of "Indexes",
# "Includes", "FollowSymLinks", "ExecCGI", or "MultiViews".
# 
# Note that "MultiViews" must be named *explicitly* --- "Options All" 
# doesn't give it to you.
# 
    Options Indexes FollowSymLinks MultiViews
 
# 
# This controls which options the .htaccess files in directories can
# override. Can also be "All", or any combination of "Options", "FileInfo",  
# "AuthConfig", and "Limit"
# 
    AllowOverride None

# 
# Controls who can get stuff from this server.
# 
    Order deny,allow
    Deny from all
    Allow from 127.0.0.1
</Directory>