diff --git a/wp-includes/rest-api.php b/wp-includes/rest-api.php
index fd6dc3e5f9..3b158ea07f 100644
--- a/wp-includes/rest-api.php
+++ b/wp-includes/rest-api.php
@@ -324,6 +324,11 @@ function get_rest_url( $blog_id = null, $path = '/', $scheme = 'rest' ) {
 		$url .= '/' . ltrim( $path, '/' );
 	} else {
 		$url = trailingslashit( get_home_url( $blog_id, '', $scheme ) );
+		// nginx only allows HTTP/1.0 methods when redirecting from / to /index.php
+		// To work around this, we manually add index.php to the URL, avoiding the redirect.
+		if ( 'index.php' !== substr( $url, 9 ) ) {
+			$url .= 'index.php';
+		}
 
 		$path = '/' . ltrim( $path, '/' );
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0896b3350a..690317afd6 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41138';
+$wp_version = '4.9-alpha-41139';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.