Added a method to disable IPv6 resolution.

Author: Fosco Marotto

src/Facebook/HttpClients/FacebookCurlHttpClient.php

@@ -67,6 +67,11 @@ class FacebookCurlHttpClient implements FacebookHttpable
    */
   protected static $facebookCurl;
 
+  /**
+   * @var boolean If IPv6 should be disabled
+   */
+  protected static $disableIPv6;
+
   /**
    * @const Curl Version which is unaffected by the proxy header length error.
    */
@@ -83,6 +88,15 @@ class FacebookCurlHttpClient implements FacebookHttpable
   public function __construct(FacebookCurl $facebookCurl = null)
   {
     self::$facebookCurl = $facebookCurl ?: new FacebookCurl();
+    self::$disableIPv6 = self::$disableIPv6 ?: false;
+  }
+
+  /**
+   * Disable IPv6 resolution
+   */
+  public function disableIPv6()
+  {
+    self::$disableIPv6 = true;
   }
 
   /**
@@ -180,6 +194,10 @@ public function openConnection($url, $method = 'GET', $parameters = array())
       $options[CURLOPT_HTTPHEADER] = $this->compileRequestHeaders();
     }
 
+    if (self::$disableIPv6) {
+      $options[CURLOPT_IPRESOLVE] = CURL_IPRESOLVE_V4;
+    }
+
     self::$facebookCurl->init();
     self::$facebookCurl->setopt_array($options);
   }