WordPress/wp-admin/load-scripts.php

<?php

/**
 * Disable error reporting
 *
 * Set this to error_reporting( -1 ) for debugging.
 */
error_reporting( 0 );

/** Set ABSPATH for execution */
if ( ! defined( 'ABSPATH' ) ) {
	define( 'ABSPATH', dirname( dirname( __FILE__ ) ) . '/' );
}

define( 'WPINC', 'wp-includes' );

$load = $_GET['load'];
if ( is_array( $load ) ) {
	$load = implode( '', $load );
}

$load = preg_replace( '/[^a-z0-9,_-]+/i', '', $load );
$load = array_unique( explode( ',', $load ) );

if ( empty( $load ) ) {
	exit;
}

require( ABSPATH . 'wp-admin/includes/noop.php' );
require( ABSPATH . WPINC . '/script-loader.php' );
require( ABSPATH . WPINC . '/version.php' );

$compress       = ( isset( $_GET['c'] ) && $_GET['c'] );
$force_gzip     = ( $compress && 'gzip' == $_GET['c'] );
$expires_offset = 31536000; // 1 year
$out            = '';

$wp_scripts = new WP_Scripts();
wp_default_scripts( $wp_scripts );

if ( isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) && stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) === $wp_version ) {
	$protocol = $_SERVER['SERVER_PROTOCOL'];
	if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ) ) ) {
		$protocol = 'HTTP/1.0';
	}
	header( "$protocol 304 Not Modified" );
	exit();
}

foreach ( $load as $handle ) {
	if ( ! array_key_exists( $handle, $wp_scripts->registered ) ) {
		continue;
	}

	$path = ABSPATH . $wp_scripts->registered[ $handle ]->src;
	$out .= get_file( $path ) . "\n";
}

header( "Etag: $wp_version" );
header( 'Content-Type: application/javascript; charset=UTF-8' );
header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expires_offset ) . ' GMT' );
header( "Cache-Control: public, max-age=$expires_offset" );

if ( $compress && ! ini_get( 'zlib.output_compression' ) && 'ob_gzhandler' != ini_get( 'output_handler' ) && isset( $_SERVER['HTTP_ACCEPT_ENCODING'] ) ) {
	header( 'Vary: Accept-Encoding' ); // Handle proxies
	if ( false !== stripos( $_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate' ) && function_exists( 'gzdeflate' ) && ! $force_gzip ) {
		header( 'Content-Encoding: deflate' );
		$out = gzdeflate( $out, 3 );
	} elseif ( false !== stripos( $_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip' ) && function_exists( 'gzencode' ) ) {
		header( 'Content-Encoding: gzip' );
		$out = gzencode( $out, 3 );
	}
}

echo $out;
exit;