HTTP response construction

Use appropriate HTTP response construction methods and status codes for API endpoints. Prefer Response.json() over manual JSON stringification, return appropriate status codes (like 404 for unmatched routes), and avoid unnecessary response complexity when simple status codes suffice.

Key practices:

• Use Response.json(data) instead of new Response(JSON.stringify(data), { headers: { "Content-Type": "application/json" } })
• Return appropriate HTTP status codes (404 for not found, 2xx for success)
• Consider whether detailed response bodies are actually needed - some clients only care about status codes

Example:

// ❌ Avoid manual JSON construction
return new Response(JSON.stringify({ success: true }), {
  status: 200,
  headers: { "Content-Type": "application/json" }
});

// ✅ Use Response.json() for JSON responses
return Response.json({ success: true });

// ✅ Return appropriate status codes for unmatched routes
if (!matchedRoute) {
  return new Response(null, { status: 404 });
}

// ✅ Simple responses when only status matters (e.g., webhooks)
return new Response("", { status: 200 });