use shorter keys in cache

    return bless {}, $class;

};

sub _uri_to_key {

    my (undef, $uri) = @_;

    return $uri->path . ":" . ($uri->query // "");

}

sub get {

    my ($self, $uri) = @_;

    my $p = $self->{data}->{$uri};

    my $key = $self->_uri_to_key($uri);

    my $p   = $self->{data}->{$key};

    if ($p) {

        $log->trace("cache hit '$uri'");

        $log->trace("etag '$p->[0]'");

        $log->trace("cache seach hit '$key' etag '$p->[0]'");

        return @$p;

    }

    $log->trace("cache miss '$uri'");

    $log->trace("cache search miss '$key'");

    return;

};

sub set {

    my ($self, $uri, $tag, $data) = @_;

    $self->{data}->{$uri} = [ $tag, $data ];

    $log->trace("cache store '$uri'");

    $log->trace("etag '$tag'");

    my $key = $self->_uri_to_key($uri);

    $self->{data}->{$key} = [ $tag, $data ];

    $log->trace("cache store '$key' etag '$tag'");

    # don't leak data

    return;

};

sub flush {

    my ($self, @uris) = @_;

    $log->trace("cache flush '", join(",", @uris), "'");

    my @keys = map { $self->_uri_to_key($_) } (grep { defined } @uris);

    if (!@uris) {

        $log->trace("cache flush all");

        $self->{data} = {};

    } else {

        delete $self->{data}->{@uris};

        $log->trace("cache flush " . join(",", map { "'$_'" } @keys))

            if $log->is_trace;

        delete $self->{data}->{@keys};

    }

    # don't leak old keys