Merge pull request #537 from ans-group/35750-incorrect-header-formatting

35750 - change header case on download pss

src/PSS/Entities/Download.php

@@ -26,7 +26,7 @@ public function getStream()
      */
     public function getContentType()
     {
-        $contentType = $this->response->getHeaders()['Content-Type'];
+        $contentType = array_change_key_case($this->response->getHeaders())['content-type'];
         if ($contentType) {
             return $contentType;
         }