From 1dc54bb2a42f17c877266b5f452bb0a9aa026dca Mon Sep 17 00:00:00 2001
From: Jerin <jerinthomascarmel@gmail.com>
Date: Sun, 15 Jun 2025 22:28:14 +0530
Subject: [PATCH] fix(transport): merge default headers with custom headers
 (#2862)

---
 src/client.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/client.ts b/src/client.ts
index f758553e2..7cc5f38ab 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -261,6 +261,8 @@ export default class Client extends API {
     }
     if (opts.serverMode === 'serverless') headers['elastic-api-version'] = serverlessApiVersion
 
+    opts.headers= Object.assign({},headers,opts.headers)
+
     const options: Required<ClientOptions> = Object.assign({}, {
       Connection: UndiciConnection,
       Transport: opts.serverMode === 'serverless' ? Transport : SniffingTransport,