diff --git a/src/Composer/Plugin/PreFileDownloadEvent.php b/src/Composer/Plugin/PreFileDownloadEvent.php
index 4372bedd6..e4921621e 100644
--- a/src/Composer/Plugin/PreFileDownloadEvent.php
+++ b/src/Composer/Plugin/PreFileDownloadEvent.php
@@ -47,6 +47,11 @@ class PreFileDownloadEvent extends Event
      */
     private $context;
 
+    /**
+     * @var array
+     */
+    private $transportOptions = array();
+
     /**
      * Constructor.
      *
@@ -135,4 +140,28 @@ class PreFileDownloadEvent extends Event
     {
         return $this->context;
     }
+
+    /**
+     * Returns transport options for the download.
+     *
+     * Only available for events with type metadata, for packages set the transport options on the package itself.
+     *
+     * @return array
+     */
+    public function getTransportOptions()
+    {
+        return $this->transportOptions;
+    }
+
+    /**
+     * Sets transport options for the download.
+     *
+     * Only available for events with type metadata, for packages set the transport options on the package itself.
+     *
+     * @param array $options
+     */
+    public function setTransportOptions(array $options)
+    {
+        $this->transportOptions = $options;
+    }
 }
diff --git a/src/Composer/Repository/ComposerRepository.php b/src/Composer/Repository/ComposerRepository.php
index 5225f4709..3d510c570 100644
--- a/src/Composer/Repository/ComposerRepository.php
+++ b/src/Composer/Repository/ComposerRepository.php
@@ -1088,13 +1088,16 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
         $retries = 3;
         while ($retries--) {
             try {
+                $options = $this->options;
                 if ($this->eventDispatcher) {
                     $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $this->httpDownloader, $filename, 'metadata', array('repository' => $this));
+                    $preFileDownloadEvent->setTransportOptions($this->options);
                     $this->eventDispatcher->dispatch($preFileDownloadEvent->getName(), $preFileDownloadEvent);
                     $filename = $preFileDownloadEvent->getProcessedUrl();
+                    $options = $preFileDownloadEvent->getTransportOptions();
                 }
 
-                $response = $this->httpDownloader->get($filename, $this->options);
+                $response = $this->httpDownloader->get($filename, $options);
                 $json = $response->getBody();
                 if ($sha256 && $sha256 !== hash('sha256', $json)) {
                     // undo downgrade before trying again if http seems to be hijacked or modifying content somehow
@@ -1180,13 +1183,15 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
         $retries = 3;
         while ($retries--) {
             try {
+                $options = $this->options;
                 if ($this->eventDispatcher) {
                     $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $this->httpDownloader, $filename, 'metadata', array('repository' => $this));
+                    $preFileDownloadEvent->setTransportOptions($this->options);
                     $this->eventDispatcher->dispatch($preFileDownloadEvent->getName(), $preFileDownloadEvent);
                     $filename = $preFileDownloadEvent->getProcessedUrl();
+                    $options = $preFileDownloadEvent->getTransportOptions();
                 }
 
-                $options = $this->options;
                 if (isset($options['http']['header'])) {
                     $options['http']['header'] = (array) $options['http']['header'];
                 }
@@ -1254,13 +1259,15 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
         }
 
         $httpDownloader = $this->httpDownloader;
+        $options = $this->options;
         if ($this->eventDispatcher) {
             $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $this->httpDownloader, $filename, 'metadata', array('repository' => $this));
+            $preFileDownloadEvent->setTransportOptions($this->options);
             $this->eventDispatcher->dispatch($preFileDownloadEvent->getName(), $preFileDownloadEvent);
             $filename = $preFileDownloadEvent->getProcessedUrl();
+            $options = $preFileDownloadEvent->getTransportOptions();
         }
 
-        $options = $this->options;
         if ($lastModifiedTime) {
             if (isset($options['http']['header'])) {
                 $options['http']['header'] = (array) $options['http']['header'];