From 0746d9569b04bbf33fd4f4deb6f319c38164f390 Mon Sep 17 00:00:00 2001
From: janniks <janniks@users.noreply.github.com>
Date: Thu, 17 Oct 2024 15:38:29 +0200
Subject: [PATCH] fix: allow read-only headers in fetch

---
 packages/network/src/fetch.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/network/src/fetch.ts b/packages/network/src/fetch.ts
index a398ac31f..21acd90a0 100644
--- a/packages/network/src/fetch.ts
+++ b/packages/network/src/fetch.ts
@@ -108,9 +108,11 @@ export function createApiKeyMiddleware({
       const reqUrl = new URL(context.url);
       if (!hostMatches(reqUrl.host, host)) return; // Skip middleware if host does not match pattern
 
-      const headers = new Headers(context.init.headers);
+      const headers =
+        context.init.headers instanceof Headers
+          ? context.init.headers
+          : (context.init.headers = new Headers(context.init.headers));
       headers.set(httpHeader, apiKey);
-      context.init.headers = headers;
     },
   };
 }