fix: bandwidth issues for 404 resources #6302

[okikio]

Overview

fixes #6302

What is it?

• Feature / enhancement
• Bug
• Docs / tests / types / typos

Description

This PR fixes a bug that causes high bandwidth usage for the 404 response for static resources. The issue is detailed in Issue #6302. The changes made in this PR ensure that the middleware uses a static error message for static resources, thus reducing the unnecessary bandwidth consumption.

Summary of changes:

1. Modified middleware to return a static "Not Found" message for static resources.
2. Added comments to the code documenting the necessity of these changes.
3. Included tests to verify the fix and ensure consistent behavior.

Use cases and why

• High bandwidth usage: When static resources result in a 404 error, the response was consuming high bandwidth. This fix reduces the bandwidth usage by using a static message.
• Consistent error messaging: Ensures that static resources always return a consistent "Not Found" message, improving the clarity and predictability of the 404 responses.

Checklist:

• My code follows the developer guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• Added new tests to cover the fix / functionality

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