Vercel Sandbox firewall now supports request proxying and filtering

Vercel has enhanced its Sandbox firewall feature to include request proxying and filtering capabilities, allowing developers to have greater control over network traffic within their sandboxed environments. These new features enable users to intercept, modify, and manage HTTP requests according to custom rules and policies. This update improves the security and flexibility of serverless function execution on the Vercel platform.

Source: Vercel Blog | 2026-05-11