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    my $identifier = $self->identifier;
    my $version    = $self->version;
    my $agent      = $self->user_agent;
    my $url        = $self->url;

    $agent->transactor->name($identifier);
    $url->path("/v$version");

    return $self;

};

# METHODS

method PREPARE ($ua, $tx, %args) {

    my $headers = $tx->req->headers;
    my $url     = $tx->req->url;

    # default headers
    $headers->header('Content-Type' => 'application/json');

    # access token parameter
    $url->query->merge(access_token => $self->access_token) if $self->access_token;

}

method resource (@segments) {

    # build new resource instance
    my $instance = __PACKAGE__->new(
        access_token => $self->access_token,
        debug        => $self->debug,
        fatal        => $self->fatal,
        retries      => $self->retries,
        timeout      => $self->timeout,
        user_agent   => $self->user_agent,
        identifier   => $self->identifier,
        version      => $self->version,

    );

    # resource locator
    my $url = $instance->url;

    # modify resource locator if possible
    $url->path(join '/', $self->url->path, @segments);

    # return resource instance
    return $instance;

}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

API::Facebook - Facebook.com API Client

=head1 VERSION

version 0.04

=head1 SYNOPSIS

    use API::Facebook;

    my $facebook = API::Facebook->new(
        access_token => 'ACCESS_TOKEN',
        identifier   => 'IDENTIFIER',
    );

    $facebook->debug(1);
    $facebook->fatal(1);

    my $feed = $facebook->me('feed');
    my $results = $feed->fetch;

    # after some introspection

    $feed->update( ... );

=head1 DESCRIPTION

This distribution provides an object-oriented thin-client library for
interacting with the Facebook (L<http://facebook.com>) API. For usage and
documentation information visit L<https://developers.facebook.com/docs/graph-api>.
API::Facebook is derived from L<API::Client> and inherits all of it's
functionality. Please read the documentation for API::Client for more usage
information.

=head1 ATTRIBUTES

=head2 access_token

    $facebook->access_token;
    $facebook->access_token('ACCESS_TOKEN');

The access_token attribute should be set to an API access token associated with
your account.

=head2 identifier

    $facebook->identifier;
    $facebook->identifier('IDENTIFIER');

The identifier attribute should be set to a string that identifies your app.

=head2 debug

    $facebook->debug;
    $facebook->debug(1);

The debug attribute if true prints HTTP requests and responses to standard out.