Drupal Association members fund grants that make connections all over the world.
When trying to get a domain name that doesn't exist, or some sort of problem with the lookup such as below, there is no error response.
$urls = array( 'http://somethingnonexistant.com/', );
drupal_http_request returns the following error result:
stdClass Object ( [code] => 0 [error] => php_network_getaddresses: getaddrinfo failed: Name or service not known )