REST API: In `get_rest_url()`, check if `$_SERVER['SERVER_NAME']` is set to avoid a PHP warning in CLI context.

Props paulschreiber.
Fixes #47854.
Built from https://develop.svn.wordpress.org/trunk@45771


git-svn-id: http://core.svn.wordpress.org/trunk@45582 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api.php

@@ -373,7 +373,7 @@ function get_rest_url( $blog_id = null, $path = '/', $scheme = 'rest' ) {
 		$url = add_query_arg( 'rest_route', $path, $url );
 	}
 
-	if ( is_ssl() ) {
+	if ( is_ssl() && isset( $_SERVER['SERVER_NAME'] ) ) {
 		// If the current host is the same as the REST URL host, force the REST URL scheme to HTTPS.
 		if ( $_SERVER['SERVER_NAME'] === parse_url( get_home_url( $blog_id ), PHP_URL_HOST ) ) {
 			$url = set_url_scheme( $url, 'https' );

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45770';
+$wp_version = '5.3-alpha-45771';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.