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Apps · 5 November 2026

Sandboxes, Apps and Functions can call App and Function addresses

A request from a sandbox, an App or a Function to an App's or a Function's address (https://<name>.runtimehost.com) used to return 403 with "Destination resolves to a forbidden address". These addresses are now reachable over HTTPS on port 443, as they are from the internet. Private address ranges, Runtime's own servers, and other ports on these names are still refused.

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