Change URLs for static content

My host has a high speed NGINX cluster.

I’d like to load my CSS, JS and media files from this cluster. I’ve followed these steps and added the new static domain via my DNS.

The new DNS settings have propagated successfully and I can access my static files like so http://static.example.com/wp-content/themes/mytheme/style.css.

To begin with, I would like to change the media upload URL. I have tried to add the following snippet to wp-config.php before require_once(ABSPATH.’wp-settings.php’);

/** Path to NGINX cluster */
define( 'UPLOADS', ''.'http://static.example.com/wp-content/uploads' );

When saving the above snippet to wp-config.php and refreshing the site, my media files (images) are loading from the following URL:

http://www.example.com/http://static.example.com/wp-content/uploads/2016/11/image-name.jpg

As you can see, the root URL is loading before the static URL. What’s the correct way to set the new upload path? Should I also perform a search and replace for the previous uploads?

I also assume that I change my JS and CSS paths in functions.php, like so?:

// Before
wp_enqueue_script( 'script', get_template_directory_uri() . '/js/script.js', array(), '20161025', false );

// After
wp_enqueue_script('script', 'http://static.example.com/wp-content/themes/mytheme/js/script.js', array(), '20161025', false );

This answer has solved the problem.

You need to add this to your functions.php file.

/**
* Custom media upload URL
* @link https://wordpress.stackexchange.com/questions/77960/wordpress-3-5-setting-custom-full-url-path-to-files-in-the-media-library
*/
add_filter( 'pre_option_upload_url_path', 'upload_url' );

function upload_url() {
    return 'http://static.yourdomain.com/wp-content/uploads';
}

There’s no need to add the original snippet to wp-config.php.