{{All the HTTP requests used to communicate with the API service are being sent using the WordPress built-in functions, so (almost) all its official features are inherited, this is useful if you need to pass these HTTP requests through a proxy. According to the official documentation you have to add some constants to the main configuration file: WP_PROXY_HOST, WP_PROXY_PORT, WP_PROXY_USERNAME, WP_PROXY_PASSWORD.}}