anonymize user-agent and don't send some headers when checking for updates

wp-includes/update.php

@@ -136,7 +136,7 @@ function wp_version_check( $extra_stats = array(), $force_check = false ) {
 
 	$options = array(
         'timeout' => $doing_cron ? 30 : 3,
-		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
+		'user-agent' => 'WordPress/' . $wp_version . ';  http://wordpress.org',
 		'headers' => array(
 			'wp_install' => home_url( '/' ),
 			'wp_blog' => home_url( '/' )
@@ -325,7 +325,7 @@ function wp_update_plugins( $extra_stats = array() ) {
 			'locale'       => wp_json_encode( $locales ),
 			'all'          => wp_json_encode( true ),
 		),
-		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' )
+		'user-agent' => 'WordPress/' . $wp_version . ';  http://wordpress.org'
 	);
 
 	if ( $extra_stats ) {
@@ -507,7 +507,7 @@ function wp_update_themes( $extra_stats = array() ) {
 			'translations' => wp_json_encode( $translations ),
 			'locale'       => wp_json_encode( $locales ),
 		),
-		'user-agent'	=> 'WordPress/' . $wp_version . '; ' . home_url( '/' )
+		'user-agent' => 'WordPress/' . $wp_version . ';  http://wordpress.org'
 	);
 
 	if ( $extra_stats ) {