From 8c4c5fcb61bd0b3bcbf6c8141ce2ea12db10fd01 Mon Sep 17 00:00:00 2001
From: qwerzl <me@qwerzl.me>
Date: Wed, 22 Jan 2025 00:06:26 +0800
Subject: [PATCH] http: return `Content-Length` header for `HEAD`s

In the current http library, all responses without body will not return
the Content-Length header.

Fixes: https://github.com/nodejs/node/issues/56680
---
 lib/_http_outgoing.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/_http_outgoing.js b/lib/_http_outgoing.js
index 23b850d1522c97..acc8ba08e7a577 100644
--- a/lib/_http_outgoing.js
+++ b/lib/_http_outgoing.js
@@ -547,7 +547,7 @@ function _storeHeader(firstLine, headers) {
   }
 
   if (!state.contLen && !state.te) {
-    if (!this._hasBody) {
+    if (!this._hasBody && this.req.method !== 'HEAD') {
       // Make sure we don't end the 0\r\n\r\n at the end of the message.
       this.chunkedEncoding = false;
     } else if (!this.useChunkedEncodingByDefault) {
@@ -932,7 +932,7 @@ function strictContentLength(msg) {
   return (
     msg.strictContentLength &&
     msg._contentLength != null &&
-    msg._hasBody &&
+    (msg._hasBody || msg.req.method === 'HEAD') &&
     !msg._removedContLen &&
     !msg.chunkedEncoding &&
     !msg.hasHeader('transfer-encoding')