fix(expo): construct the new Request to avoid immutable headers error on Cloudflare Workers (#7774)

(cherry picked from commit ecbd1e0b2a)

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,
 			};