diff --git a/src/Symfony/Component/HttpClient/CurlHttpClient.php b/src/Symfony/Component/HttpClient/CurlHttpClient.php
index bbcaf69e3b..e69761b392 100644
--- a/src/Symfony/Component/HttpClient/CurlHttpClient.php
+++ b/src/Symfony/Component/HttpClient/CurlHttpClient.php
@@ -269,7 +269,7 @@ final class CurlHttpClient implements HttpClientInterface, LoggerAwareInterface,
         if ($options['bindto']) {
             if (file_exists($options['bindto'])) {
                 $curlopts[\CURLOPT_UNIX_SOCKET_PATH] = $options['bindto'];
-            } elseif (preg_match('/^(.*):(\d+)$/', $options['bindto'], $matches)) {
+            } elseif (0 !== strpos($options['bindto'], 'if!') && preg_match('/^(.*):(\d+)$/', $options['bindto'], $matches)) {
                 $curlopts[\CURLOPT_INTERFACE] = $matches[1];
                 $curlopts[\CURLOPT_LOCALPORT] = $matches[2];
             } else {
diff --git a/src/Symfony/Component/HttpClient/NativeHttpClient.php b/src/Symfony/Component/HttpClient/NativeHttpClient.php
index 0710b7a72b..18bf8f569b 100644
--- a/src/Symfony/Component/HttpClient/NativeHttpClient.php
+++ b/src/Symfony/Component/HttpClient/NativeHttpClient.php
@@ -67,8 +67,16 @@ final class NativeHttpClient implements HttpClientInterface, LoggerAwareInterfac
     {
         [$url, $options] = self::prepareRequest($method, $url, $options, $this->defaultOptions);
 
-        if ($options['bindto'] && file_exists($options['bindto'])) {
-            throw new TransportException(__CLASS__.' cannot bind to local Unix sockets, use e.g. CurlHttpClient instead.');
+        if ($options['bindto']) {
+            if (file_exists($options['bindto'])) {
+                throw new TransportException(__CLASS__.' cannot bind to local Unix sockets, use e.g. CurlHttpClient instead.');
+            }
+            if (0 === strpos($options['bindto'], 'if!')) {
+                throw new TransportException(__CLASS__.' cannot bind to network interfaces, use e.g. CurlHttpClient instead.');
+            }
+            if (0 === strpos($options['bindto'], 'host!')) {
+                $options['bindto'] = substr($options['bindto'], 5);
+            }
         }
 
         $options['body'] = self::getBodyAsString($options['body']);