From 0829ea3ea1649440358001233874e7cf8cbd67a2 Mon Sep 17 00:00:00 2001
From: "D. Berge" <dberge@aaltronav.eu>
Date: Sun, 24 Sep 2023 12:17:16 +0200
Subject: [PATCH] Save a copy of the headers not the original.

Otherwise ExpressJS will complain about trying to modify
headers that have already been sent.
---
 lib/www/server/api/middleware/etag/cache.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/www/server/api/middleware/etag/cache.js b/lib/www/server/api/middleware/etag/cache.js
index 49c1633..df18002 100644
--- a/lib/www/server/api/middleware/etag/cache.js
+++ b/lib/www/server/api/middleware/etag/cache.js
@@ -33,7 +33,7 @@ function saveResponse (res) {
 			const cache = getCache(res);
 			const req = res.req;
 			console.log(`Saving ETag: ${req.method} ${req.url} → ${etag}`);
-			const headers = res.getHeaders();
+			const headers = structuredClone(res.getHeaders());
 			delete headers["set-cookie"];
 			cache[req.url] = {etag, headers};
 		}