From 00738f54410f03a50c7678bfec12cb49e40ef5ad Mon Sep 17 00:00:00 2001
From: Hiroaki Nakamura <hnakamur@gmail.com>
Date: Wed, 28 Oct 2026 08:00:14 +0900
Subject: [PATCH] Add Content-Length only when length is not zero in formatting
 tests

- Always update Content-Length when the test has already Content-Length.
- Add Content-Length only when the length is not zero if the test does
  not have Content-Length.
---
 test/regression/regression_test.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/regression/regression_test.cc b/test/regression/regression_test.cc
index 18f61b64dc..fc5aeb024d 100644
--- a/test/regression/regression_test.cc
+++ b/test/regression/regression_test.cc
@@ -259,7 +259,7 @@ static void update_content_length(std::vector<std::pair<std::string, std::string
             has_content_length = true;
         }
     }
-    if (!has_content_length) {
+    if (!has_content_length && length != 0) {
         headers.emplace_back(std::pair{"Content-Length", std::to_string(length)});
     }
 }