From c8e5dd6aa9d2f1688dbc81af4072bd909b908ed0 Mon Sep 17 00:00:00 2001
From: Thomas Landauer <thomas@landauer.at>
Date: Sun, 13 Sep 2020 17:02:25 +0200
Subject: [PATCH] Update http_client.rst

Integrating the findings of https://github.com/symfony/symfony/issues/38082#issuecomment-690529165
---
 http_client.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/http_client.rst b/http_client.rst
index 0d8648643b7..14c73d4eb82 100644
--- a/http_client.rst
+++ b/http_client.rst
@@ -642,6 +642,11 @@ when the streams are large)::
         'body' => $formData->bodyToString(),
     ]);
 
+If you need to add a custom HTTP header to the upload, you can do::
+
+    $headers = $formData->getPreparedHeaders()->toArray();
+    $headers[] = 'X-Foo: bar';
+
 Cookies
 ~~~~~~~