From e835966e1c4fcb6edae439a02001328ffaba1d17 Mon Sep 17 00:00:00 2001
From: Marco Ippolito <marcoippolito54@gmail.com>
Date: Thu, 26 Jan 2023 12:04:29 +0100
Subject: [PATCH] http: res.setHeader 18.x backport

---
 lib/_http_server.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/_http_server.js b/lib/_http_server.js
index 94f2d899e13a27..b46e7b0906dfea 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -378,6 +378,9 @@ function writeHead(statusCode, reason, obj) {
         if (k) this.setHeader(k, obj[k]);
       }
     }
+    if (k === undefined && this._header) {
+      throw new ERR_HTTP_HEADERS_SENT('render');
+    }
     // Only progressive api is used
     headers = this[kOutHeaders];
   } else {