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  # Just in case we're dealing with a file-based db like SQLite:
  foreach my $key (qw/ session main /)
  {
    $s->{data_connections}->{$key}->{dsn} =~ s/\@ServerRoot\@/$root/;
    $s->{data_connections}->{$key}->{dsn} =~ s/\@ProjectRoot\@/$project_root/;
    $s->{data_connections}->{$key}->{dsn} =~ s{\\\\}{\\}g;
  }# end foreach()
  
  # Make sure that $s->page_cache_root exists:
  unless( $s->{web}{page_cache_root} )
  {
    if( $^O =~ m{win32}i )
    {
      my $temp_root = $ENV{TMP} || $ENV{TEMP};
      $s->{web}{page_cache_root} = "$temp_root\\PAGE_CACHE";
    }
    else
    {
      $s->{web}{page_cache_root} = "/tmp/PAGE_CACHE";
    }# end if()
  }# end unless()
   
  unless( -d $s->{web}{page_cache_root} )
  {
    my @parts = split /[\/\\]/, $s->{web}{page_cache_root};
    my $root = $^O =~ m{win32}i ? '' : "/";
    while( my $next = shift(@parts) )
    {
      $root .= "$next/";
      mkdir($root) unless -d $root;
      die "Cannot create path to '@{[ $s->web->page_cache_root ]}' - stopped at '$root': $!"
        unless -d $root;
      chmod(0777, $root);
    }# end while()
  }# end unless()
  
  (my $compiled_root = $s->{web}->{page_cache_root} . '/' . $s->{web}->{application_name}) =~ s/::/\//g;
  my $folder = $^O =~ m{win32}i ? '' : "/";
  foreach my $part ( grep { $_ } split /[\/\\]/, $compiled_root )
  {
    $folder .= "$part/";
    unless( -d $folder )
    {
      mkdir($folder);
      chmod(0777, $folder)
    }# end unless()
    confess "Folder '$folder' does not exist and cannot be created"
      unless -d $folder;
  }# end foreach()
  
  confess "Folder '$folder' exists but cannot be written to"
    unless -w $folder;
}# end init_server_root()


sub load_class
{
  my ($s, $class) = @_;
  
  (my $file = "$class.pm") =~ s/::/\//g;
  eval { require $file; }
    or confess "Cannot load $class: $@";
}# end load_class()


sub DESTROY
{
  my $s = shift;
  undef(%$s);
}


1;# return true:

=pod

=head1 NAME

ASP4::Config - Central configuration for ASP4

=head1 SYNOPSIS

  # Settings:
  $Config->system->settings->some_setting;
  $Config->system->settings->another_setting;
  
  # Error-handling:
  $Config->errors->error_handler;
  $Config->errors->mail_errors_to;
  $Config->errors->mail_errors_from;
  $Config->errors->smtp_server;
  
  # Web:
  $Config->web->application_name;
  $Config->web->application_root;
  $Config->web->project_root;
  $Config->web->www_root;
  $Config->web->handler_root;
  $Config->web->media_manager_upload_root;
  $Config->web->page_cache_root;
  
  # Data Connections:
  foreach my $conn ( map { $Config->data_connections->$_ } qw/ session application main / )
  {
    my $dbh = DBI->connect(
      $conn->dsn,
      $conn->username,
      $conn->password
    );
  }# end foreach()

=head1 JSON Config File

ASP4::ASP keeps all of its configuration inside of C</conf/asp4-config.json>

Here is an example:

  {
    "system": {
      "post_processors": [