ly for the current request so that we don't serve a blank page.
		$this->doesFileExist();

		$options = aioseo()->options->noConflict();
		if ( ! $options->sitemap->{aioseo()->sitemap->type}->enable ) {
			$this->notFoundPage();

			return;
		}

		$entries = aioseo()->sitemap->content->get();
		$total   = aioseo()->sitemap->content->getTotal();
		if ( ! $entries ) {
			$addonsEntries = aioseo()->addons->doAddonFunction( 'content', 'get' );
			$addonTotals   = aioseo()->addons->doAddonFunction( 'content', 'getTotal' );
			foreach ( $addonsEntries as $addonSlug => $addonEntries ) {
				if ( ! empty( $addonEntries ) ) {
					$entries = $addonEntries;
					$total   = ! empty( $addonTotals[ $addonSlug ] ) ? $addonTotals[ $addonSlug ] : count( $entries );
					break;
				}
			}
		}

		if ( 0 === $total && empty( $entries ) ) {
			status_header( 404 );
		}

		$this->xsl->saveXslData(
			aioseo()->sitemap->requestParser->slug,
			$entries,
			$total
		);

		$this->headers();
		aioseo()->sitemap->output->output( $entries );
		aioseo()->addons->doAddonFunction( 'output', 'output', [ $entries ] );

		exit;
	}

	/**
	 * Checks if static file should be served and generates it if it doesn't exist.
	 *
	 * This essentially acts as a safety net in case a file doesn't exist yet or has been deleted.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	protected function doesFileExist() {
		aioseo()->addons->doAddonFunction( 'sitemap', 'doesFileExist' );

		if (
			'general' !== $this->type ||
			! aioseo()->options->sitemap->general->advancedSettings->enable ||
			! in_array( 'staticSitemap', aioseo()->internalOptions->internal->deprecatedOptions, true ) ||
			aioseo()->options->sitemap->general->advancedSettings->dynamic
		) {
			return;
		}

		require_once ABSPATH . 'wp-admin/includes/file.php';
		if ( ! aioseo()->core->fs->exists( get_home_path() . $_SERVER['REQUEST_URI'] ) ) {
			$this->scheduleRegeneration();
		}
	}

	/**
	 * Sets the HTTP headers for the sitemap.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function headers() {
		$charset = aioseo()->helpers->getCharset();
		header( "Content-Type: text/xml; charset=$charset", true );
		header( 'X-Robots-Tag: noindex, follow', true );
	}

	/**
	 * Redirects to a 404 Not Found page if the sitemap is disabled.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function notFoundPage() {
		global $wp_query;
		$wp_query->set_404();
		status_header( 404 );
		include get_404_template();
		exit;
	}

	/**
	 * Registers an active sitemap addon and its classes.
	 * NOTE: This is deprecated and only there for users who already were using the previous sitemap addons version.
	 *
	 * @final 4.2.7
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function addAddon() {}
}