Issue #3168940: Cache is not returning proper results when there are no query arguments passed to the request

src/Service/Client.php

@@ -135,13 +135,16 @@ class Client {
    *
    * @param array $args
    *   Args to request.
+   * @param string $method
+   *   Method called in the request.
    *
    * @return array
    *   Return the args array.
    */
-  private function buildArgs(array $args) {
+  private function buildArgs(array $args, $method) {
     // Add in additional parameters then sort them for signing.
     $args['APIKey'] = $this->api_key;
+    $args['method'] = $method;
     ksort($args);
 
     return $args;