- Add type assertion check for session ID context value to prevent panic\n- Add 10MB request body size limit to prevent memory exhaustion\n- Return 413 (Request Entity Too Large) for oversized requests\n- Add maxBodySize constant for easy adjustment
- Create package-level httpClient with 300s timeout\n- Reuse client instead of creating new one per request\n- Prevents resource exhaustion under load\n- Reduces connection overhead
- Define blockedHeaders map for headers that should never be forwarded
- Include Referer, Cookie, X-Forwarded-* headers
- Prevents leaking internal URLs, session data, and client IPs to upstream
- Defensive measure even though no headers are currently copied
