Unset cache control in api response array

Author: BastiaanGrutters

app/code/community/Mage42/PostcodeNL/Model/System/Config/Source/AutocompleteCountry.php

@@ -12,7 +12,9 @@ public function toOptionArray($isMultiselect = false)
                 ['value' => 'error', 'label' => $response['mage42_postcodenl_message']]
             ];
         }
-
+        
+        // Unset unexpected cache-control array property, to be able to loop through the countries
+        unset($response['cache-control']);
         $result = array();
         foreach ($response as $country)
         {
@@ -24,4 +26,4 @@ public function toOptionArray($isMultiselect = false)
 
         return $result;
     }
-}
+}