From 87ca825717928d178de8a3458f163100925fb675 Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Thu, 27 Jun 2024 17:05:20 +0200
Subject: [PATCH] [HttpClient][Mailer] Revert "Let curl handle transfer
 encoding", use HTTP/1.1 for Mailgun

---
 CurlHttpClient.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/CurlHttpClient.php b/CurlHttpClient.php
index 4c5ced3..3a2fba0 100644
--- a/CurlHttpClient.php
+++ b/CurlHttpClient.php
@@ -246,8 +246,9 @@ public function request(string $method, string $url, array $options = []): Respo
 
             if (isset($options['normalized_headers']['content-length'][0])) {
                 $curlopts[\CURLOPT_INFILESIZE] = (int) substr($options['normalized_headers']['content-length'][0], \strlen('Content-Length: '));
-            } elseif (!isset($options['normalized_headers']['transfer-encoding'])) {
-                $curlopts[\CURLOPT_INFILESIZE] = -1;
+            }
+            if (!isset($options['normalized_headers']['transfer-encoding'])) {
+                $curlopts[\CURLOPT_HTTPHEADER][] = 'Transfer-Encoding:'.(isset($curlopts[\CURLOPT_INFILESIZE]) ? '' : ' chunked');
             }
 
             if ('POST' !== $method) {