From 0beae7e8120d0752f0c689ddb2be4434656550cb Mon Sep 17 00:00:00 2001
From: Olivier Bellone <ob@stripe.com>
Date: Mon, 16 Nov 2020 10:36:00 -0800
Subject: [PATCH] Force IPv4 resolving

---
 lib/HttpClient/CurlClient.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/HttpClient/CurlClient.php b/lib/HttpClient/CurlClient.php
index 1f9f0d5e2..ae78a6cd7 100644
--- a/lib/HttpClient/CurlClient.php
+++ b/lib/HttpClient/CurlClient.php
@@ -271,6 +271,10 @@ public function request($method, $absUrl, $headers, $params, $hasFile)
             $opts[\CURLOPT_HTTP_VERSION] = \CURL_HTTP_VERSION_2TLS;
         }
 
+        // Stripe's API servers are only accessible over IPv4. Force IPv4 resolving to avoid
+        // potential issues (cf. https://github.com/stripe/stripe-php/issues/1045).
+        $opts[\CURLOPT_IPRESOLVE] = \CURL_IPRESOLVE_V4;
+
         list($rbody, $rcode, $rheaders) = $this->executeRequestWithRetries($opts, $absUrl);
 
         return [$rbody, $rcode, $rheaders];
@@ -283,7 +287,6 @@ public function request($method, $absUrl, $headers, $params, $hasFile)
     private function executeRequestWithRetries($opts, $absUrl)
     {
         $numRetries = 0;
-        $isPost = \array_key_exists(\CURLOPT_POST, $opts) && 1 === $opts[\CURLOPT_POST];
 
         while (true) {
             $rcode = 0;