public function get_items( $request ) {
    /*
		 * Include an unmodified `$wp_version`, so the API can craft a response that's tailored to
		 * it. Some plugins modify the version in a misguided attempt to improve security by
		 * obscuring the version, which can cause invalid requests.
		 */
    require ABSPATH . WPINC . '/version.php';

    $valid_query_args = array(
      'offset'   => true,
      'order'    => true,
      'orderby'  => true,
      'page'     => true,
      'per_page' => true,
      'search'   => true,
      'slug'     => true,
    );
    $query_args       = array_intersect_key( $request->get_params(), $valid_query_args );

    $query_args['locale']             = get_user_locale();
    $query_args['wp-version']         = $wp_version;
    $query_args['pattern-categories'] = isset( $request['category'] ) ? $request['category'] : false;
    $query_args['pattern-keywords']   = isset( $request['keyword'] ) ? $request['keyword'] : false;

    $query_args = array_filter( $query_args );

    $transient_key = $this->get_transient_key( $query_args );

    /*
		 * Use network-wide transient to improve performance. The locale is the only site
		 * configuration that affects the response, and it's included in the transient key.
		 */
    $raw_patterns = get_site_transient( $transient_key );

    if ( ! $raw_patterns ) {
      $api_url = 'http://api.wordpress.org/patterns/1.0/?' . build_query( $query_args );
      if ( wp_http_supports( array( 'ssl' ) ) ) {
        $api_url = set_url_scheme( $api_url, 'https' );
      }

      /*
			 * Default to a short TTL, to mitigate cache stampedes on high-traffic sites.
			 * This assumes that most errors will be short-lived, e.g., packet loss that causes the
			 * first request to fail, but a follow-up one will succeed. The value should be high
			 * enough to avoid stampedes, but low enough to not interfere with users manually
			 * re-trying a failed request.
			 */
      $cache_ttl      = 5;
      $wporg_response = wp_remote_get( $api_url );
      $raw_patterns   = json_decode( wp_remote_retrieve_body( $wporg_response ) );

      if ( is_wp_error( $wporg_response ) ) {
        $raw_patterns = $wporg_response;

      } elseif ( ! is_array( $raw_patterns ) ) {
        // HTTP request succeeded, but response data is invalid.
        $raw_patterns = new WP_Error(
          'pattern_api_failed',
          sprintf(
            /* translators: %s: Support forums URL. */
            __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
            __( 'https://wordpress.org/support/forums/' )
          ),
          array(
            'response' => wp_remote_retrieve_body( $wporg_response ),
          )
        );

      } else {
        // Response has valid data.
        $cache_ttl = HOUR_IN_SECONDS;
      }

      set_site_transient( $transient_key, $raw_patterns, $cache_ttl );
    }

    if ( is_wp_error( $raw_patterns ) ) {
      $raw_patterns->add_data( array( 'status' => 500 ) );

      return $raw_patterns;
    }

    $response = array();

    if ( $raw_patterns ) {
      foreach ( $raw_patterns as $pattern ) {
        $response[] = $this->prepare_response_for_collection(
          $this->prepare_item_for_response( $pattern, $request )
        );
      }
    }

    return new WP_REST_Response( $response );
  }