Vercel Sandbox firewall has added support for request proxying and filtering. Developers can now route outbound sandbox traffic through a custom proxy by setting a forwardURL on allowed domains, enabling logging, debugging, or transforming HTTP requests and responses. New matcher support allows fine-grained control, scoping proxy forwarding or credentials brokering to specific paths, methods, query strings, or headers. The feature is available in beta for Pro and Enterprise plans via the @vercel/sandbox SDK.

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