test if dns errors resolve without global dns cache

app/Console/Commands/RequestFetcher.php

@@ -245,6 +245,7 @@ class RequestFetcher extends Command
             CURLOPT_TIMEOUT => 7,
             CURLOPT_HEADER => true,
             CURLOPT_NOPROGRESS => false,
+            CURLOPT_DNS_USE_GLOBAL_CACHE => false,
             CURLOPT_PROGRESSFUNCTION => 'self::progress',
         ));