From d0a6a19c4367f793a92a94b2c7db4b9dd6860330 Mon Sep 17 00:00:00 2001
From: Joe Hosteny <jhosteny@gmail.com>
Date: Thu, 5 Dec 2024 16:04:08 -0500
Subject: [PATCH] fix: properly accumulate custom headers

---
 lib/aws/request.ex | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/aws/request.ex b/lib/aws/request.ex
index 49d5be0c..e955a588 100644
--- a/lib/aws/request.ex
+++ b/lib/aws/request.ex
@@ -326,8 +326,8 @@ defmodule AWS.Request do
 
       param_value when is_map(param_value) ->
         headers =
-          Enum.reduce(param_value, headers, fn {k, v} ->
-            {header_name <> k, v}
+          Enum.reduce(param_value, headers, fn {k, v}, acc ->
+            [{header_name <> k, v}] ++ acc
           end)
 
         params = Map.delete(params, param_name)