protected function close_http_connection() {
		// Only 1 PHP process can access a session object at a time, close this so the next request isn't kept waiting.
		// @codingStandardsIgnoreStart
		if ( session_id() ) {
			session_write_close();
		}
		// @codingStandardsIgnoreEnd

		wc_set_time_limit( 0 );

		// fastcgi_finish_request is the cleanest way to send the response and keep the script running, but not every server has it.
		if ( is_callable( 'fastcgi_finish_request' ) ) {
			fastcgi_finish_request();
		} else {
			// Fallback: send headers and flush buffers.
			if ( ! headers_sent() ) {
				header( 'Connection: close' );
			}
			@ob_end_flush(); // @codingStandardsIgnoreLine.
			flush();
		}
	}