Ticket #26726: get-remote-first-bytes.php

<?php
// Plugin Name: Get Remote First Bytes

function get_remote_first_bytes( $url ) {
        if ( ! function_exists( 'wp_tempnam' ) ) {
                require_once( ABSPATH . 'wp-admin/includes/file.php' );
        }

        // @see download_url()
        $file = wp_tempnam( $url );

        $response = wp_remote_get( $url, array(
                'stream'              => true,
                'filename'            => $file,
                'limit_response_size' => 32768, // 32 KB
        ) );

        echo size_format( filesize( $file ) );
        
        unlink( $file );
}

$url = 'https://archive.org/download/corblund2013-03-14.matrix.flac/corblund2013-03-14track09.mp3';
get_remote_first_bytes( $url );