Forward default HttpDownloader options to RemoteFilesystem/CurlDownloader, fixes #8757

src/Composer/Util/HttpDownloader.php

@@ -155,6 +155,7 @@ class HttpDownloader
                 // start job
                 $url = $job['request']['url'];
                 $options = $job['request']['options'];
+                $options = array_replace_recursive($this->options, $options);
 
                 $job['status'] = HttpDownloader::STATUS_STARTED;
 
@@ -236,6 +237,8 @@ class HttpDownloader
             return;
         }
 
+        $options = array_replace_recursive($this->options, $options);
+
         if ($job['request']['copyTo']) {
             $this->curl->download($resolve, $reject, $origin, $url, $options, $job['request']['copyTo']);
         } else {