Immutable Headers Issue in Cloudflare Workers with Remix and Hono

[damonpetta]

Issue Description

When running a Remix application with Hono and Cloudflare Workers, an error occurs when modifying headers.

Environment

• Wrangler: v3.84.1
• @remix-run/cloudflare: 2.13.1
• @remix-run/react: 2.13.1
• hono: 4.6.8
• remix-hono: 0.0.16

Steps to Reproduce

1. Set up a Remix project with Hono and Cloudflare Workers
2. Implement static asset handling using the staticAssets function
3. Run the application using Wrangler

Error Message

TypeError: Can't modify immutable headers.

Root Cause

The error occurs because the staticAssets middleware attempts to modify the if-none-match header directly on the immutable Request object. In newer versions of the runtime or dependencies, this operation is not allowed on immutable headers.