From 5e83ebc2f91c90b4c5b7584526658bd1aa910ab6 Mon Sep 17 00:00:00 2001
From: Taesu <166604494+bytaesu@users.noreply.github.com>
Date: Wed, 4 Feb 2026 02:27:25 +0900
Subject: [PATCH] fix(expo): construct the new Request to avoid immutable
 headers error on Cloudflare Workers (#7774)

(cherry picked from commit ecbd1e0b2a25d7e7c6320a56dfbf4d3153fe2434)
---
 packages/expo/src/index.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/packages/expo/src/index.ts b/packages/expo/src/index.ts
index 1f0a256938..1e2b334531 100644
--- a/packages/expo/src/index.ts
+++ b/packages/expo/src/index.ts
@@ -35,8 +35,12 @@ export const expo = (options?: ExpoOptions | undefined) => {
 			if (!expoOrigin) {
 				return;
 			}
-			const req = request.clone();
-			req.headers.set("origin", expoOrigin);
+
+			// Construct new Headers with new Request to avoid mutating the original request
+			const newHeaders = new Headers(request.headers);
+			newHeaders.set("origin", expoOrigin);
+			const req = new Request(request, { headers: newHeaders });
+
 			return {
 				request: req,
 			};