Send additional header info for inserted media.

gistfile1.php

<?php
function send_extra_media_info( $html, $send_id, $attachment ) {
  @header( "X-Attachment-ID: " . intval( $send_id ) );

	foreach( array('post_title', 'image-size' ) as $key ) {
		if( array_key_exists($key, $attachment) ) {
			@header( "X-".$key.": " . str_replace( array( "\r", "\n"), ' ', $attachment[$key] ) );
		}
	}

	return $html;
}

add_filter('media_send_to_editor', 'send_extra_media_info', 10, 3);