From ed53ea20611095a763702ea69e6d30a82157b6d8 Mon Sep 17 00:00:00 2001
From: Dorian Niemiec <dorian.niemiec@svrjs.org>
Date: Thu, 19 Dec 2024 22:33:01 +0100
Subject: [PATCH] fix: fix the cache mod not working in Bun, because of
 extraneous res.writeHead operation

---
 src/index.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/index.js b/src/index.js
index 30cdf56..dfa8a4c 100644
--- a/src/index.js
+++ b/src/index.js
@@ -77,11 +77,13 @@ module.exports = function (req, res, logFacilities, config, next) {
 
   res.writeHead = function (statusCode, statusCodeDescription, headers) {
     const properHeaders = headers ? headers : statusCodeDescription;
-    Object.keys(properHeaders).forEach((key) => {
-      writtenHeaders[key.toLowerCase()] = properHeaders[key];
-    });
-    writtenStatusCode = statusCode;
-    res.setHeader("X-SVRJS-Cache", "MISS");
+    if (typeof properHeaders === "object" && properHeaders !== null) {
+      Object.keys(properHeaders).forEach((key) => {
+        writtenHeaders[key.toLowerCase()] = properHeaders[key];
+      });
+      writtenStatusCode = statusCode;
+      res.setHeader("X-SVRJS-Cache", "MISS");
+    }
     if (headers) {
       originalWriteHead(
         writtenStatusCode,