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

wp-includes/update.php

@@ -140,11 +140,11 @@ function wp_version_check( $extra_stats = array(), $force_check = false ) {
 	$doing_cron = wp_doing_cron();
 
 	$options = array(
-		'timeout'    => $doing_cron ? 30 : 3,
-		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
-		'headers'    => array(
-			'wp_install' => $wp_install,
-			'wp_blog'    => home_url( '/' ),
+        'timeout' => $doing_cron ? 30 : 3,
+		'user-agent' => 'WordPress/' . $wp_version . ';  http://wordpress.org',
+		'headers' => array(
+			'wp_install' => home_url( '/' ),
+			'wp_blog' => home_url( '/' )
 		),
 		'body'       => $post_body,
 	);
@@ -361,7 +361,7 @@ 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 ) {
@@ -546,7 +546,7 @@ 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 ) {