Vercel Sandbox firewall now supports request proxying and filtering (opens in new tab)

**Published:** May 11, 2026 | **Authors:** Tom Lienard, Valerian Roche, Brandon Tuttle --- The Vercel Sandbox firewall now supports forwarding specific HTTP requests to a proxy you control. You can also use matchers to scope forwarding and credentials brokering to only the requests that need it. ### Requests proxying You can now route outbound sandbox traffic through your own proxy for logging, debugging, or transforming requests and responses. Set a `forwardURL` on any allowed domain, an...