Untitled

<?php
$client = new Zend\Http\Client;
$client->setHeaders(array('Last-Modified' => 'fake'));
var_dump($client->getRequest()->headers());
var_dump($client->getRequest()->headers()->toArray());

/**
object(Zend\Http\Headers)#2 (3) {
  ["pluginClassLoader":protected]=>
  NULL
  ["headersKeys":protected]=>
  array(1) {
    [0]=>
    string(12) "lastmodified"
  }
  ["headers":protected]=>
  array(1) {
    [0]=>
    array(2) {
      ["name"]=>
      string(13) "Last-Modified"
      ["line"]=>
      string(19) "Last-Modified: fake"
    }
  }
}
array(1) {
  ["Last-Modified"]=>
  string(4) "fake"
}
*/

// @see https://github.com/zendframework/zf2/pull/603/files