libphutil% git show
commit 1f2ae38e22879819eda466174fbdcbefa3a5f761
Author: Lovro Puzar <lovro.puzar@gmail.com>
Date:   Wed Aug 28 17:29:52 2019

    Force curl to use HTTP 1.1 as a workaround for 408 from Google LB



diff --git a/src/future/http/HTTPSFuture.php b/src/future/http/HTTPSFuture.php
index 0064a8f..9409d93 100644
--- a/src/future/http/HTTPSFuture.php
+++ b/src/future/http/HTTPSFuture.php
@@ -206,6 +206,7 @@ final class HTTPSFuture extends BaseHTTPFuture {
       curl_multi_add_handle(self::$multi, $curl);

       curl_setopt($curl, CURLOPT_URL, $uri);
+      curl_setopt($curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);

       if (defined('CURLOPT_PROTOCOLS')) {
         // cURL supports a lot of protocols, and by default it will honor