From 487b6f5de401619ccc877d93010ee5c44410957d Mon Sep 17 00:00:00 2001
From: Gil Pedersen <git@gpost.dk>
Date: Fri, 22 Mar 2024 14:37:01 +0100
Subject: [PATCH] Only iterate headers once

---
 lib/index.js | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/index.js b/lib/index.js
index cbaf81f..b14c4c9 100755
--- a/lib/index.js
+++ b/lib/index.js
@@ -115,12 +115,15 @@ internals.Client = class {
         }
 
         uri.method = method.toUpperCase();
-        uri.headers = Object.assign({}, options.headers);
+        uri.headers = Object.create(null);
 
         const usedHeaders = new Set();
-        for (const [key, value] of Object.entries(uri.headers)) {
-            if (value !== undefined) {
-                usedHeaders.add(key.toLowerCase());
+        if (options.headers) {
+            for (const [key, value] of Object.entries(options.headers)) {
+                if (value !== undefined) {
+                    uri.headers[key] = value;
+                    usedHeaders.add(key.toLowerCase());
+                }
             }
         }