override.php

/**
 * Filters the HTTP request arguments before the request is made.
 *
 * This function checks if the request URL is for WordPress updates or plugin/theme information.
 * If so, it replaces the default API URL with our URLs.
 * Cloned from wpe_use_wpe_api_services
 *
 * @param bool|array $c     Whether to preempt the request return. Default false.
 * @param array      $args  HTTP request arguments.
 * @param string     $url   The request URL.
 *
 * @return bool|array The response or false if not preempting the request.
 */
function klarned_override_api_services( $c, $args, $url ) {
	if ( strpos( $url, 'downloads.wordpress.org' ) !== false && apply_filters( 'klarned_override_api_downloads', true ) ) {
		// Replace the default API URL with WPE's URL.
		$url = str_replace( '://downloads.wordpress.org', '://dotorg-downloads-proxy.yourdomain.com', $url );
		return wp_remote_request( $url, $args );
	}

	return $c;
}
add_filter( 'pre_http_request', 'klarned_override_api_services', 10, 3 );